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7mm SAUM Questions

RedGoat

RedGoat

3.14=PI.E
Full Member
Minuteman
Jun 4, 2011
596
0
41
Houston, TX
#1
Been putting a lot of thought into a 7mm SAUM build for hunting/target/competition rifle. I have found some good info here on the Hide and on other sites, but have a few off the wall questions. And was hoping some of the members that are actually shooting the 7mm could throw some info at me:

- Barrel length has been a very hard thing to get real answers on. Everyone has there opinion about it, but I was hoping that someone here could actually post some facts: bullet weight/barrel length/velocity. My goal is to push the 180gr VLD somewhere around ~2900fps with the shortest barrel that will accommodate it.

- Does the SAUM have any OAL issues in a SA with the 180gr VLDs? I have heard that it does and it doesn't. Is there ever a need to push the COAL past the standard 2.800"? And if there is a need can I just mod my mag/feed ramp to give it enough breathing room instead of needing to go with a LA?


6mmbr - 7mm Guide
Figured I would post this link so no one else had to.
 
#2
Re: 7mm SAUM Questions

Goatphius,

It's a little hard to reach 2900 FPS + with a 180 gr VLD, in a barrel length any shorter than 26", if you stay @ 2.825", with a 7mm SAUM. I could not reach 2850 safely with a 7mm 175 gr SMK in a 7mm SAUM 24" barreled hunting rifle, Rem 700 SS, @ a COAL of 2.815" a few years back.

Better to go with a Seekins WSM DBM, which fits in a Short action BTW, with minor mods, and allows bullet seating up to 3.14". That extra 0.3" should allow enough powder to get your velocities north of 2900 FPS, in a 24" to 26" length barrel.


Bob
 
#3
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BobinNC</div><div class="ubbcode-body">Better to go with a Seekins WSM DBM, which fits in a Short action BTW, with minor mods, and allows bullet seating up to 3.14". That extra 0.3" should allow enough powder to get your velocities north of 2900 FPS, in a 24" to 26" length barrel.</div></div>

With the 0.300" added by the Seekins DMB would I need to modify my feed ramp to accommodate the extra OAL of the round to feed properly from the mag? If I could push a 180gr VLD at ~2900fps from a 24" barrel that would be tits. Thanks for the intel Bob

Goat
 
#4
Re: 7mm SAUM Questions

I have done a lot of research on this very topic when I was looking fir a new 7mm build myself. I have shot a 7 of several different kinds for the past ten years so let me advise a little. First of as Bobinnc stated velocity of 3000 is hard to achieve with the 180 VLD. Barrel length should be at least 27 inches to 30 to push the round to 3000 fps, which is where the round performs the best. Another issue is the fact that Remington brass is the only available brass for the SAUM so hope foe the best. Barrel life for most 7's pushing 180 gr pills will be around 2000. Your best bet to accomplish your goal is to run a straight .284 with 180 VLD's, 175/180 SMK's, or 162 Hornady A-MAX's. Lapua brass is available for the .284 as well as very good load data from 6mmbr.com. The last several world records have been set with this combination. Look up the recent thread on Short Action Customs .284( page 5 bolt action forum) that Mark built for himself, 2.5 inch group at 750 yards... Impressive! Go this route and you will not be disappointed.
 
#5
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Special Delivery</div><div class="ubbcode-body">I have done a lot of research on this very topic when I was looking fir a new 7mm build myself. I have shot a 7 of several different kinds for the past ten years so let me advise a little. First of as Bobinnc stated velocity of 3000 is hard to achieve with the 180 VLD. Barrel length should be at least 27 inches to 30 to push the round to 3000 fps, which is where the round performs the best. Another issue is the fact that Remington brass is the only available brass for the SAUM so hope foe the best. Barrel life for most 7's pushing 180 gr pills will be around 2000. Your best bet to accomplish your goal is to run a straight .284 with 180 VLD's, 175/180 SMK's, or 162 Hornady A-MAX's. Lapua brass is available for the .284 as well as very good load data from 6mmbr.com. The last several world records have been set with this combination. Look up the recent thread on Short Action Customs .284( page 5 bolt action forum) that Mark built for himself, 2.5 inch group at 750 yards... Impressive! Go this route and you will not be disappointed. </div></div>

I originally was considering the .284 but wasn't liking the longer barrel length. So I started leaning toward the 7mm SAUM because it can push the round harder out of a shorter barrel. I'm not looking to push the 180gr at 3000, I would be happy with 2900fps. And if I can get 2900fps with the SAUM by letting out the OAL with a 24-26" barrel that sounds ideal.


Goat
 
#7
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Goatphius</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BobinNC</div><div class="ubbcode-body">Better to go with a Seekins WSM DBM, which fits in a Short action BTW, with minor mods, and allows bullet seating up to 3.14". That extra 0.3" should allow enough powder to get your velocities north of 2900 FPS, in a 24" to 26" length barrel.</div></div>

With the 0.300" added by the Seekins DMB would I need to modify my feed ramp to accommodate the extra OAL of the round to feed properly from the mag? If I could push a 180gr VLD at ~2900fps from a 24" barrel that would be tits. Thanks for the intel Bob

Goat </div></div>

Goat,

Not sure exactly what surgery is required to fit the Seekins WSM DBM to a short action. On his website, Glen says <span style="font-style: italic">"Slight alterations to the receiver will be needed to use the 338 Lapua or WSM systems, similar to those needed for an extended mag box."</span>

Best to contact Glen Seekins and get the straight dope.

Bob
 
#8
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BobinNC</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Goatphius</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BobinNC</div><div class="ubbcode-body">Better to go with a Seekins WSM DBM, which fits in a Short action BTW, with minor mods, and allows bullet seating up to 3.14". That extra 0.3" should allow enough powder to get your velocities north of 2900 FPS, in a 24" to 26" length barrel.</div></div>

With the 0.300" added by the Seekins DMB would I need to modify my feed ramp to accommodate the extra OAL of the round to feed properly from the mag? If I could push a 180gr VLD at ~2900fps from a 24" barrel that would be tits. Thanks for the intel Bob

Goat </div></div>

Goat,

Not sure exactly what surgery is required to fit the Seekins WSM DBM to a short action. On his website, Glen says <span style="font-style: italic">"Slight alterations to the receiver will be needed to use the 338 Lapua or WSM systems, similar to those needed for an extended mag box."</span>

Best to contact Glen Seekins and get the straight dope.

Bob </div></div>

Thanks for the info I'm pretty sure the feed ramp needs to be notched to allow the longer rounds to feed from the mag. I had been looking to do the entire mod on the mag and ramp myself but finding the Seekins WSM DBM is going to make the process much easier. I'll be giving Glen a call. Thanks again for pointing me in the right direction you definitely saved me some time.


Goat
 
#9
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Special Delivery</div><div class="ubbcode-body">If you are set on 24"-26" barrels, then yes the SAUM is a great choice. Check out http://www.6mmbr.com/7mm284.html , you may have already seen this article but if not it's great knowledge. Good luck Goat</div></div>

Yeah have read that page numerous times. I actually put a link to it in my original post at the bottom. Thanks for the info.
 
#10
Re: 7mm SAUM Questions

I would shoot the 180g Hybrids over the 180g VLDs if I were you. The BC is higher and the Hybrids are not very sensitive to OAL. I shoot the Hybrids out of my .284 Shehane and it shot well from 5 off to 40 off. I can't say the same things for the 180g VLDs, they needed jammed in my barrel.

Also, if you point the Hybrids, you get around an 8% increase in BC which gets your G1 BC around 0.7. Very nice.
 
#11
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kyreloader</div><div class="ubbcode-body">I would shoot the 180g Hybrids over the 180g VLDs if I were you. The BC is higher and the Hybrids are not very sensitive to OAL. I shoot the Hybrids out of my .284 Shehane and it shot well from 5 off to 40 off. I can't say the same things for the 180g VLDs, they needed jammed in my barrel.

Also, if you point the Hybrids, you get around an 8% increase in BC which gets your G1 BC around 0.7. Very nice.</div></div>

Do you know what the OAL for a max loaded SAUM round is with the 180gr hybrids? And also please explain pointing the hybrids to increase the BC.
 
#12
Re: 7mm SAUM Questions

Goat,

The Berger 7mm 180 gr Hybrid is 1.529" long vs 1.525" for the 180 gr VLD. Bearing surface on the 180 Hybrid is 0.459" vs 0.541" for the 180 VLD. The nose length is 0.850" on the Hybrid and 0.764" on the VLD. The neck on the 7mm SAUM is 0.311" long.

From there you can figure out the rest.

Bob
 
#13
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Goatphius</div><div class="ubbcode-body">

Do you know what the OAL for a max loaded SAUM round is with the 180gr hybrids? And also please explain pointing the hybrids to increase the BC. </div></div>

Here is a link to an interview with Bryan Litz where he explains the Hybrid bullets and the increase expected with pointing. See Question #6. He can explain it better than I can. I use the Whidden Pointing die.

http://www.safclass.com.au/celebrity3.html
 
#14
Re: 7mm SAUM Questions

Bob,

Thanks for the numbers. Now time to start crunching.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kyreloader</div><div class="ubbcode-body">http://www.safclass.com.au/celebrity3.html</div></div>

Thanks for the link, very good info for where the future of shooting might be headed. Nice to see Berger is going to be offering some higher BC .30 cal bullets, too bad they are going to be 230gr. What is going to be really interesting to see is what they end up offering in the 6.5mm area.
 
#15
Re: 7mm SAUM Questions

Kyreloader,

Just got finished reading the article and holy hell this new hybrid round is insane. .674 G1 BC and receives an 8% improvement from running it though a pointing die, giving it a BC improvement of +.054 making it's G1 BC = .728. And on top of that it's not as picky as the VLDs with where it's seated. Wow Bryan Litz has really out done himself with this one.
 
#17
Re: 7mm SAUM Questions

Here are some brass options for the 7mm SAUM:

- Remington
- Nosler should be coming out with some soon, or maybe they already have
- Necked-down Norma 300 Rem SAUM

No Lapua but more than just R-P brass.
 
#18
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: importsstillsuck</div><div class="ubbcode-body">What barrel twist would that hybrid round like? I have a 7mm mag.</div></div>

I have seen 1:8" -- 1:8.5" -- 1:8.73" -- 1:9"

I'm not sure which is optimum for the Hybrid, Berger suggest a twist of 1:9" or faster. So I'm sure any of these will do.
 
#19
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Goatphius</div><div class="ubbcode-body">Kyreloader,

Just got finished reading the article and holy hell this new hybrid round is insane. .674 G1 BC and receives an 8% improvement from running it though a pointing die, giving it a BC improvement of +.054 making it's G1 BC = .728. And on top of that it's not as picky as the VLDs with where it's seated. Wow Bryan Litz has really out done himself with this one. </div></div>

Those are the reasons that I am shooting them. Since I started shooting them, I have been unable to think of a reason to shoot the VLDs or any other 7mm bullets. They shoot really well for me too.

Here are some more thoughts on these bullets.

7mm Berger Hybrids
 
#22
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Special Delivery</div><div class="ubbcode-body"> Look up the recent thread on Short Action Customs .284( page 5 bolt action forum) that Mark built for himself, 2.5 inch group at 750 yards... Impressive! Go this route and you will not be disappointed. </div></div>
Anybody have this link?
 
#23
Re: 7mm SAUM Questions

I have had no problems getting 2900+fps on my 7mm WSM with a myriad of 175-180gr bullets with a 25.5" barrel. I have a slightly longer throat than SAMMI given my reamer availability but in general you should be able to get 2900fps in a 24" bbl withth eh SAUM IMHO.

I don't think that there's a "need" to go past the COAL of 2.800" other than you can stuff more powder behind the bullet. If you're shooting for a 24" barrel then it might not make much of a difference in velocities with the additional powder. In my gun I do have issues with extracting a live round in my "Remington 700 SA" with cartridge OAL's over about 2.900" but the #10-32unf screw hole in the receiver for the trigger guard's been machined some for the DBM I have. If you use a Seekins or similar DBM you can just notch the bottom of the receiver's mag well to get them to feed.

Right now I prefer to use the 180SMK as it fits in my Alpha magazines while maintaining ~.010" off the lands (2.960" COAL) the Berger hybrid is about .110" longer cartridge length when .01" off the lands. When you build your SAUM you might spec a shorter throat to keep the OALs with the VLDs and hybrids to a magazine comptable length.

background 180SMK @ 2.960"
foreground 180 Berger hybrid
both seated .010" off the lands in my gun
sdkxex.jpg


I haven't had a chance to test the Berger loads but what I do have for 7WSM data now is:
175 SMK 63gr H4831sc LR primer 2912fps
175 SMK 65gr H4831sc LR primer 2966fps
175 SMK 71gr Retumbo mag primer 3009fps (takes a lot of tapping to keep from compressing, 3.055" OAL)
180 SMK 65.5gr Win WXR Rem 9.5 primer 3010fps
180 SMK 67gr Retumbo mag primer 2901fps
180 SMK 70gr Retumbo mag primer 3001fps
 
#27
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tylerw02</div><div class="ubbcode-body">Another consideration is that there really isn't a maker of SAUM brass. What is the best option these days? Necking down Nosler brass?</div></div>

These are the brass sources that I'm tracking:
- R-P 7 SAUM brass
- Nosler 7 SAUM soon available
- Necking-down 300 Rem SAUM brass
 
#28
Re: 7mm SAUM Questions

After crunching some numbers think this is the current setup: Surgeon 591 WSM Action, it has a port opening of 3.110" and the bolt travels an extra 0.095" to the rear to accommodate feeding and extracting rounds with longer OAL. Will have a Seekins WSM DBM, it allows an OAL of 3.140". And plan to have the chamber throat taken out to a 180gr Hybrid loaded out to 3.100" touching the lands. Then just need a trigger and a KMW Sentinel stock with an IMB and should have a nice rig. Either going to get a Rock Creek or Krieger depending on lead times.

Does anyone see any possible issues with this so far?

Also considering a Bighorn action. Does anyone know the port opening size it has and does it extend to the rear extra to aid extraction. If it will fit with the build I think I might like to use a Bighorn.


Goat
 
#30
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: McFred</div><div class="ubbcode-body">I have had no problems getting 2900+fps on my 7mm WSM with a myriad of 175-180gr bullets with a 25.5" barrel. I have a slightly longer throat than SAMMI given my reamer availability but in general you should be able to get 2900fps in a 24" bbl withth eh SAUM IMHO.

I don't think that there's a "need" to go past the COAL of 2.800" other than you can stuff more powder behind the bullet. If you're shooting for a 24" barrel then it might not make much of a difference in velocities with the additional powder. In my gun I do have issues with extracting a live round in my "Remington 700 SA" with cartridge OAL's over about 2.900" but the #10-32unf screw hole in the receiver for the trigger guard's been machined some for the DBM I have. If you use a Seekins or similar DBM you can just notch the bottom of the receiver's mag well to get them to feed.

Right now I prefer to use the 180SMK as it fits in my Alpha magazines while maintaining ~.010" off the lands (2.960" COAL) the Berger hybrid is about .110" longer cartridge length when .01" off the lands. When you build your SAUM you might spec a shorter throat to keep the OALs with the VLDs and hybrids to a magazine comptable length.

background 180SMK @ 2.960"
foreground 180 Berger hybrid
both seated .010" off the lands in my gun
sdkxex.jpg


I haven't had a chance to test the Berger loads but what I do have for 7WSM data now is:
175 SMK 63gr H4831sc LR primer 2912fps
175 SMK 65gr H4831sc LR primer 2966fps
175 SMK 71gr Retumbo mag primer 3009fps (takes a lot of tapping to keep from compressing, 3.055" OAL)
180 SMK 65.5gr Win WXR Rem 9.5 primer 3010fps
180 SMK 67gr Retumbo mag primer 2901fps
180 SMK 70gr Retumbo mag primer 3001fps

</div></div>

McFred Thanks for the intel, those numbers look nice, how is the accuracy on your rig? As for barrel length I have been leaning toward a 25" 1:8.5" twist barrel (#14 if Krieger or what ever the equivalent is for Rock Creek).
 
#31
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Outerspace</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Special Delivery</div><div class="ubbcode-body"> Look up the recent thread on Short Action Customs .284( page 5 bolt action forum) that Mark built for himself, 2.5 inch group at 750 yards... Impressive! Go this route and you will not be disappointed. </div></div>
Anybody have this link?</div></div>

Short Action Customs .284 Build - Beautiful!!
 
#32
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Goatphius</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tylerw02</div><div class="ubbcode-body">Another consideration is that there really isn't a maker of SAUM brass. What is the best option these days? Necking down Nosler brass?</div></div>

These are the brass sources that I'm tracking:
- R-P 7 SAUM brass
- Nosler 7 SAUM soon available
- Necking-down 300 Rem SAUM brass </div></div>

If brass is a concern, I would just go with the WSM. Remington brass isn't all that good. And the Nosler brass I have pretty much taken a shit after 3 reloads.

Plus with a WSM you don't have issues on trying to get up to speed.
 
#33
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bacarrat</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Goatphius</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tylerw02</div><div class="ubbcode-body">Another consideration is that there really isn't a maker of SAUM brass. What is the best option these days? Necking down Nosler brass?</div></div>

These are the brass sources that I'm tracking:
- R-P 7 SAUM brass
- Nosler 7 SAUM soon available
- Necking-down 300 Rem SAUM brass </div></div>

If brass is a concern, I would just go with the WSM. Remington brass isn't all that good. And the Nosler brass I have pretty much taken a shit after 3 reloads.

Plus with a WSM you don't have issues on trying to get up to speed. </div></div>

Norma makes 300 SAUM brass that's every bit as good as Lapua. It is easy to do the neck/trim/turn operations for serious brass prep and you end up with 7 SAUM Norma brass.

I've been shooting the 7mm 180 Hybrids for about 14 months now.

They have an excellent BC, without pointing them the numbers that Bryan published are right on for everything that I've shot them in.

The bullets have allowed me to shoot the best groups that I've ever pushed out in any conditions. Several times now I have shot them (from 2 different rifles) into sub 6" groups at 1000yd from a lightweight bipod and rear bag setup.

I have found that they're stable from a 9tw until about Mach 1.15 and then they have issues. I have not been able to shoot them to the sound barrier from an 8 twist yet but I will be trying that on Sandwarrior's advice.

My 7/300 WSM with 73.5gr of Retumbo has cut a couple of groups under 2" at 600yd with them and they're going 3100fps on average from a 27" tube.
 
#34
Re: 7mm SAUM Questions

And you can also neck down 300WSM or neck up 270 brass to create 7WSM brass. But most people don't since both of those have longer necks...
 
#35
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bohem</div><div class="ubbcode-body">I have found that they're stable from a 9tw until about Mach 1.15 and then they have issues. I have not been able to shoot them to the sound barrier from an 8 twist yet but I will be trying that on Sandwarrior's advice.</div></div>

Mach 1 = 1116.3969 fps
Mach 1.15 = 1283.8564 fps

Are you saying that a 1:8" twist barrel would help keep the bullet stabilized after it goes far enough to be subsonic?
 
#36
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bacarrat</div><div class="ubbcode-body">And you can also neck down 300WSM or neck up 270 brass to create 7WSM brass. But most people don't since both of those have longer necks... </div></div>

Yes. After you fireform them, it will be 7 WSM brass. The base to shoulder length is longer on the 7 WSM compared to the 270 and 300.



<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Goatphius</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bohem</div><div class="ubbcode-body">I have found that they're stable from a 9tw until about Mach 1.15 and then they have issues. I have not been able to shoot them to the sound barrier from an 8 twist yet but I will be trying that on Sandwarrior's advice.</div></div>

Mach 1 = 1116.3969 fps
Mach 1.15 = 1283.8564 fps

Are you saying that a 1:8" twist barrel would help keep the bullet stabilized after it goes far enough to be subsonic? </div></div>

That's what I've been told. The actual fps speed of sound changes on the density, which changes with altitude and temp (and a little bit with humidity) so those values you have are not useful unless you know what conditions those are at.

That's why I gave a Mach number instead.

But yes, short answer is that I've been told an 8 twist will get them to remain stable through transition. I have a mind to test it, but I haven't been up to the old strip pit to try it out and I don't have another 1900yd range unless I go out to TVP and that's a 12 hour round trip (just driving)
 
#38
Re: 7mm SAUM Questions

I shoot the 7wsm Berger 180's vlds out of a Rem 700 Short action, with Badger bottom metal. 2975Fps. Gap has them reamer just for the 180's so that you can seat the out there, and still fit in the Alpha mag. I have taken my 7wsm to 2000 yard in a 26 inch 8.7 twist barrel. Had no problems at all stabilizing the round. I am shooting at 6,500 feet 61 deg at the time.

I am building a 7saum AI right now. The barrel just got in, so wont be able to cambering it until tomorrow. I am hopping in the next few day I have be able to shot it. Had a reamer made for the 180's, that will let the bullet sit way out there, and still fit in my Bighorn short action. Hoping for 3050+ out of a 28 inch barrel. Also going to Nitrite the Barrel. The guys here are loving it. 6000 rounds out of a 6.5-284 with a ave of 100Fps faster. Some are getting 200Fps faster with the salt bath barrel.
 
#39
Re: 7mm SAUM Questions

I'm interested in the nitriding process. In the past I have read that the company claims no velocity increase/decrease. Which to me didn't make sense, considering that the process makes the barrel slicker for cleaning, why not slicker for shooting. Skyking -- Do you have any before/after load data showing your velocity increases.

Here is a link to the Trutec website
Trutec Salt Bath Nitriding
 
#40
Re: 7mm SAUM Questions

Skyking I know you have already been shooting the 7wsm (I saw your 1400yd video) and now your building a 7 SAUM. Was hoping I could get your opinion/pros&cons on the two. I was going to PM you the question, but figured everyone could benefit from your answer. Thanks for the intel in advance.

-Goat
 
#41
Re: 7mm SAUM Questions

My next build will be a 7saum or a 7mmMag. I plan on keeping it a SA so the SAUM seems to be the way to go. I have been watching this thread regularly for updates. My concern with the SAUM is that the 180 grn bullets can't be loaded out long enough to meet at the boattail/shoulder junction and still fit in the mags. It seems that the 168vlds can do it though. How important is this for you guys who are shooting the 7SAUM?
 
#42
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Goatphius</div><div class="ubbcode-body">Skyking I know you have already been shooting the 7wsm (I saw your 1400yd video) and now your building a 7 SAUM. Was hoping I could get your opinion/pros&cons on the two. I was going to PM you the question, but figured everyone could benefit from your answer. Thanks for the intel in advance.

-Goat </div></div>

I'm also interested why, they are so similar. Is it because of Nosler's new 7 SAUM brass?
 
#43
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Tango__Down</div><div class="ubbcode-body">My next build will be a 7saum or a 7mmMag. I plan on keeping it a SA so the SAUM seems to be the way to go. I have been watching this thread regularly for updates. My concern with the SAUM is that the 180 grn bullets can't be loaded out long enough to meet at the boattail/shoulder junction and still fit in the mags. It seems that the 168vlds can do it though. How important is this for you guys who are shooting the 7SAUM?

</div></div>

Tango__Down here is a post I put further up in the thread. This is the build I plan on putting together. With the Surgeon WSM action and Seekins WSM DBM you basically end up with an extended short action that accommodates a max 3.140" OAL (you will need to notch the feed ramp on the Surgeon WSM action .030"). That should be more than enough to seat the 180gr Hybrids where ever needed. Even better the 180gr Hybrids aren't as picky as the 180gr VLD as to where they are seated. Hope this helps


<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Goatphius</div><div class="ubbcode-body">After crunching some numbers think this is the current setup: Surgeon 591 WSM Action, it has a port opening of 3.110" and the bolt travels an extra 0.095" to the rear to accommodate feeding and extracting rounds with longer OAL. Will have a Seekins WSM DBM, it allows an OAL of 3.140". And plan to have the chamber throat taken out to a 180gr Hybrid loaded out to 3.100" touching the lands. Then just need a trigger and a KMW Sentinel stock with an IMB and should have a nice rig. Either going to get a Rock Creek or Krieger depending on lead times.

Does anyone see any possible issues with this so far?

Also considering a Bighorn action. Does anyone know the port opening size it has and does it extend to the rear extra to aid extraction. If it will fit with the build I think I might like to use a Bighorn.


Goat</div></div>
 
#45
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Tango__Down</div><div class="ubbcode-body">What mags Are the seekins WSM bottom metal using?</div></div>

I think that Seekins is manufacturing their own mags. They originally only had 3 round mags and later came out with 5 round mags. If I'm wrong someone correct me.


-Goat
 
#46
Re: 7mm SAUM Questions

For the WSM and Lapua kits we make out own mags because no one else makes a mag with as much internal length for longer rounds. You can easily feed 180gr 7wsm rounds, seated properly out of a short action with our mag system. We have 3 and 5rd mags available for both.
 
#47
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: heatseekins</div><div class="ubbcode-body">For the WSM and Lapua kits we make out own mags because no one else makes a mag with as much internal length for longer rounds. You can easily feed 180gr 7wsm rounds, seated properly out of a short action with our mag system. We have 3 and 5rd mags available for both. </div></div>

There you are an answer from the horses mouth. I don't see why more manufacturers haven't caught on, and started making WSM kits with more OAL. Considering how much the WSM has been debated back and forth SA/LA. Just extend the SA out and you have the best of both worlds. Glenn what is the current lead time on the WSM DBM system?


Goat
 
#48
Re: 7mm SAUM Questions

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Goatphius</div><div class="ubbcode-body">Skyking I know you have already been shooting the 7wsm (I saw your 1400yd video) and now your building a 7 SAUM. Was hoping I could get your opinion/pros&cons on the two. I was going to PM you the question, but figured everyone could benefit from your answer. Thanks for the intel in advance.

-Goat</div></div>

I really cant tell you about the 7saum yet. Just got my gun done on Monday. Plus I am doing a 7suam AI. Blowing the neck out to 35' the same as the WSM. Going to call it the 7STM. I have shoot a few rounds down it to fire form the brass. The one bad thing is Rem brass over the Win brass. I can already tell the Rem brass is softer. We will see if the longer neck give better accuracy, and longer barrel life. I am going to salt bath nitride my barrel so that is not a good comparison anyways. LOSOK Custom Arms will do it for $100 a barrel. Talked with a few of his customers. They are loving it. One guy has done 6 different guns. His 6.5-284 has 5000 rounds down it now.

I absolutely love my WSM. Really wanted to build another gun and could not do to the exactly the same. I really don't think you can beat those Berger 180's.
If I had to do it over again. This is what I would use.

Mcmillan A3-5 Again.
Bighorn action!!! NO question about it. Never build another gun on anything other then that action.
Seeking's BDM
Reamer for the 180's in that bottom metal.

Here is some pictures of my half-way done gun. Need to brake in the barrel. Send to get treated. cerakote it, and turn down the muzzle brake. Don't mind the clay on the stock. I am working on making some new Carbon-Fiber shells with that palm swell for the AICS. So this is a test stock.

M1420001.jpg

M1420002.jpg

M1420003.jpg

M1420008.jpg


From Left to Right,
7wsm 180,7saum AI 180, 7saum 180. OAL. 2.955
M1420011.jpg
 
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