7 saum

[gnatmm]

Any starting load to share for N570 and 180 hybrids? TIA

 

[Milo 2.5]

This is with a .188" freebore reamer, case OAL of 3.020". If you push the bullet in the case more, lighten up, farther out, maybe up charge.
First one start, 2nd upper end.
I shoot 180 hybrids 8 off the lands, 210M primer.
Crap, they are backwards, not redoing.

 

[gnatmm]

This is with a .188" freebore reamer, case OAL of 3.020". If you push the bullet in the case more, lighten up, farther out, maybe up charge.
First one start, 2nd upper end.
I shoot 180 hybrids 8 off the lands, 210M primer.
Crap, they are backwards, not redoing.
View attachment 7105293
View attachment 7105293

Thanks!

 

[LarsA]

im loading 180 hybrids with n565 now. 60,7 grains, 79mm col. getting aruond 904ms on a 74 cm barrel. i tried 180 eld but it wout not gruop a bit, got pressure signs aruond 64 grains with the 180eld, and aruond 62 with the 180 hybrids.
im using norma brass and a tikka action with a lilja 1-8 barrel

 

[Ogbybay]

180 ELD-M
Norma brass
Fed LR magnum primer
57 gr H4831SC
COAL 3.08" (0.02 jump)
MV 2819 ES 9 SD 3
26" Benchmark barrel/DTA-SRS

 

[tomcatfan]

So I finally got my PVA shouldered prefit in 7mm RSAUM on my SA nucleus and did some load development. I’ve only tried 180 eld’s, H1000 and re-26. I started by loading to mag length and shot H1000 between 63.0 and 64.2 in 0.2 gr increments. None of those groups shot less than 1 moa. Mag length was about a 0.050" jump with the eld with my throat so maybe mag length isn’t going to work for me.

I tried loading into the lands and single feeding, it got a little better, but not ideal. It was only trying 0.010" jump did I find a consistent sub moa group. The ONLY load I could find was 63.8 gr H1000 with the 180 gr eld with a 0.010" jump that shoots consistently with any accuracy. The only problem is my velocities aren’t that great. Using virgin Norma brass, 63.8 gr of H1000, my average velocity is 2894 ft/sec with an ES of 44 with a SD of 18. Target is below.

I wanted this barrel to shoot out to a mile, but those velocity spreads are going to give me some pretty bad vertical strings. Overall, I’m not very satisfied with the 7mm saum. I guess I could try to use a bullet in the 160 gr class, but the bc’s of the 180’s are important to get out to a mile.

 

[Steel head]

Is this a standard SAMMI chamber?
Cut or button?

Almost 2900 would be acceptable to me.

Fired brass, different primers and some more barrel mileage might improve your SD’s as well.

I’d also try more jump ranges.


I was thinking about having PVA do my 7SAUM barrel but I wanted longer than 26” so I went elsewhere.

 

[levi8599]

Here is my data for my 7saum with h1000 running 2900fps. It’s plenty with those bc’s

So I finally got my PVA shouldered prefit in 7mm RSAUM on my SA nucleus and did some load development. I’ve only tried 180 eld’s, H1000 and re-26. I started by loading to mag length and shot H1000 between 63.0 and 64.2 in 0.2 gr increments. None of those groups shot less than 1 moa. Mag length was about a 0.050" jump with the eld with my throat so maybe mag length isn’t going to work for me.

I tried loading into the lands and single feeding, it got a little better, but not ideal. It was only trying 0.010" jump did I find a consistent sub moa group. The ONLY load I could find was 63.8 gr H1000 with the 180 gr eld with a 0.010" jump that shoots consistently with any accuracy. The only problem is my velocities aren’t that great. Using virgin Norma brass, 63.8 gr of H1000, my average velocity is 2894 ft/sec with an ES of 44 with a SD of 18. Target is below.

I wanted this barrel to shoot out to a mile, but those velocity spreads are going to give me some pretty bad vertical strings. Overall, I’m not very satisfied with the 7mm saum. I guess I could try to use a bullet in the 160 gr class, but the bc’s of the 180’s are important to get out to a mile.

View attachment 7118986

 

[tomcatfan]

Is this a standard SAMMI chamber?
Cut or button?

Almost 2900 would be acceptable to me.

Fired brass, different primers and some more barrel mileage might improve your SD’s as well.

I’d also try more jump ranges.


I was thinking about having PVA do my 7SAUM barrel but I wanted longer than 26” so I went elsewhere.

I’m ok with the speed and I agree that fired brass might help. It is a cut barrel. I’m thinking it should speed up with a little more mileage.

 

[MTETM]

I’m ok with the speed and I agree that fired brass might help. It is a cut barrel. I’m thinking it should speed up with a little more mileage.

Some more data for you.
My 7 SAUM has an .040FB.
Norma brass, fed 210, H1K at 62.7.
180 ELD.
28 inch Benchmark
This is 2.920 oal...mag fit and .020 off lands.
2880 fps, sd 10... this is over about 30 rounds..
.5 moa vertical out to 1K

Hope you get your working

 

[*Tavman*]

My rifle just got finished last week. I'm looking for a good starting point for RL 26 and the 180 ELDM. The Alliant website does not provide any data for the 7 SAUM. I have heard that folks are finding RL 26 to work really well and I already have some on hand.
The search feature on this thread also does not produce any results for RL 26.

 

[Milo 2.5]

My rifle just got finished last week. I'm looking for a good starting point for RL 26 and the 180 ELDM. The Alliant website does not provide any data for the 7 SAUM. I have heard that folks are finding RL 26 to work really well and I already have some on hand.
The search feature on this thread also does not produce any results for RL 26.

I shot some 26 in mine with a 180 hybrid, so use discretion here, but you should end up between 59 - 62.5gr.

 

[tomcatfan]

My rifle just got finished last week. I'm looking for a good starting point for RL 26 and the 180 ELDM. The Alliant website does not provide any data for the 7 SAUM. I have heard that folks are finding RL 26 to work really well and I already have some on hand.
The search feature on this thread also does not produce any results for RL 26.

In my experience 26 is way faster than h1000. I didn't get any accuracy in mine. I shot from 60.5 up to 63. My velocities were between 2900 and 3050 with a 180 eld.

 

[levi8599]

In my experience 26 is way faster than h1000. I didn't get any accuracy in mine. I shot from 60.5 up to 63. My velocities were between 2900 and 3050 with a 180 eld.

I tried both and couldn’t get a good load with 26 but my buddy did with 61.6. I did however get a load with h1000 at 63gr and it’s moving at 2900 which is fast enough for me. My buddy is running over 3k with 26.

 

[Praeger]

I'm starting a 7 SAUM build and am looking for recommendations for bushing size for sizing die. I plan on using the Redding Type S Match 2 die set. What size are you using with which brand of brass? I'm only finding Norma brass in stock.

 

[Steel head]

For my ADG brass it’s .318 loaded so I’d use a .315-.316 bushing.

 

[Praeger]

For my ADG brass it’s .318 loaded so I’d use a .315-.316 bushing.

How do you like the ADG brass? It was my first choice, but no availability until October 2019.

 

[Steel head]

How do you like the ADG brass? It was my first choice, but no availability until October 2019.

Don’t know
Haven’t used it yet.
It is very nice looking.

 

[317millhand]

order gunworks brass
it is rebranded ADG. excellent stuff

 

[317millhand]

Some more data for you.
My 7 SAUM has an .040FB.
Norma brass, fed 210, H1K at 62.7.
180 ELD.
28 inch Benchmark
This is 2.920 oal...mag fit and .020 off lands.
2880 fps, sd 10... this is over about 30 rounds..
.5 moa vertical out to 1K

Hope you get your working

at 2.920 that bullet has to be way down inside the case. as much as I wanted to, I didnt have any luck with the 180eld in my short action. I assumed it was because the bullet was so far into the case. actually past the shoulder

 

[Praeger]

order gunworks brass
it is rebranded ADG. excellent stuff

Never would have thought to look. Just ordered 100.

 

[bjay]

For my ADG brass it’s .318 loaded so I’d use a .315-.316 bushing.

My loaded adg is 316 im using 314 redding bushing..

 

[Steel head]

My loaded adg is 316 im using 314 redding bushing..

Your necks must be a bit thinner than mine.

I just measured one and it’s .3175

 

[MTETM]

I don't have any issues. I shoot 197 smk at similar numbers... out to 1600 havent had issues. This is a .040 FB...

 

[bjay]

Your necks must be a bit thinner than mine.

I just measured one and it’s .3175

Yup probably

 

[Praeger]

I don't have any issues. I shoot 197 smk at similar numbers... out to 1600 havent had issues. This is a .040 FB...

Did you use a SAAMI reamer or custom? Looks like no issues stabilizing with a 1-8 twist barrel.

 

[MTETM]

Did you use a SAAMI reamer or custom? Looks like no issues stabilizing with a 1-8 twist barrel.

I had the reamer cut for shooting 180 VLD's in a short action. It is a .320 nk .040 FB. The FB is much shorter than SAAMI. If you would like, I can get you a copy of the print.
My loaded necks are .315 with Norma brass.

 

[Praeger]

I had the reamer cut for shooting 180 VLD's in a short action. It is a .320 nk .040 FB. The FB is much shorter than SAAMI. If you would like, I can get you a copy of the print.
My loaded necks are .315 with Norma brass.

Yes - thanks. I have a SAAMI reamer, but haven't cut any barrels yet.

 

[Steel head]

I had the reamer cut for shooting 180 VLD's in a short action. It is a .320 nk .040 FB. The FB is much shorter than SAAMI. If you would like, I can get you a copy of the print.
My loaded necks are .315 with Norma brass.

I wouldn’t mind seeing that print.
I went with a SAMMI print reamer for the barrel I ordered.

 

[XTREM HTR16]

I’m trying R23 with the 168 VLD, with 57.0 I was at 2,750 in a 23.5” 700 Ti with Ultra 7 suppressor. Would love to get 2,900. Will R23 get me there or should I go to R26?

 

[317millhand]

h1000 should get 2900 pretty easy. im at 3000 with 162 eld-x from a 24 inch barrel.

 

[Sheldon N]

Messed around with the 7SAUM a bit more recently. Hadn't shot it in what seems like a year.

180 ELD-M
2.95 COAL (big jump, barrel is throated long),
RL26 60.0gr
210M primer
30" 8 twist heavy varmint barrel
2970 fps

Did pretty well at a mile. BC trued up to an unimpressive .348 G7 at that distance, potentially influenced by transonic performance. Shooting at a full size IPSC, slightly bladed, so about 0.2 mils wide. Good calm conditions so went 3/3 once I got elevation dialed in.

 

[Steel head]

My smith said reamer is going to be there this week so my 7SAUM barrel should be here really soon.
I’m excited!

 

[350 Mag]

7mm Saum.

Rem 700 S/A
24 " Kreiger Barrel
McMillan A3

Throated for 180 Berger.


Rem Brass

Virgin, full length resized, (all within .003 length) so did not trim, chambered and deburred, primer pocket uniformed, flash hole deburred.

Did not weight sort brass.

Noticed while seating I had a few pieces that seated way too easy? So after 1x would likely turn necks and use collet die.

H-1000
CCi-BR2
Hornady ELD-X 175(.005 off lands) 2.335 C.T.B.O

Not much published data so had starting load of 62 grains.

This was just an experiment to find a sweet spot to explore in more detail. So I did 3 round groups and .5 grain increments up to 65 gr.

62 gr had a av velocity of 2859.

Best groups and numbers came around

64.0 -65 grains.

Pressure signs were same on all the brass nothing notable.

64.5 numbers were

Lo 2952
Hi 2964
Av 2956
ES 12.29
Sd 6.63

Sub moa group


65 grains

Lo 2964
Hi 2976
Av 2970
Es 12.3
Sd 6.08

Again sub moa.

My next round of loading will be from 64.0 up to 65.5

Going to do 5 shot strings.

First time using 7mm ELD-X 175 and very pleased with velocity out of 24" barrel with H-1000.

Also I usually use Fed 215 Match primers but very pleased with CCi-BR2.

 

[Steel head]

Savage prefit heavy Palma brux 7 saum.

 

[Steel head]

ADG 7 saum brass all brand new.
ELD-m 180’s @ 2.95
H100
62=2805
62.5=2831 SD 9
63=2855

all three shot really well at 1125 yards today.

recoil was amazingly light.

 

[317millhand]

Messed around with the 7SAUM a bit more recently. Hadn't shot it in what seems like a year.

180 ELD-M
2.95 COAL (big jump, barrel is throated long),
RL26 60.0gr
210M primer
30" 8 twist heavy varmint barrel
2970 fps

Did pretty well at a mile. BC trued up to an unimpressive .348 G7 at that distance, potentially influenced by transonic performance. Shooting at a full size IPSC, slightly bladed, so about 0.2 mils wide. Good calm conditions so went 3/3 once I got elevation dialed in.

Do you know the freebore on that reamer, or the distance to lands at 2.950?

 

[Steel head]

Do you know the freebore on that reamer, or the distance to lands at 2.950?

I know with my barrel lands are at 3.050 with 180 ELDm’s

 

[Sheldon N]

Do you know the freebore on that reamer, or the distance to lands at 2.950?

I haven't measured it, but it's a LOT. Bought the barrel from someone else who had it throated to single feed F-Class in a short action. I think maybe long enough for it to keep the bullet bearing surface above neck/shoulder junction.

Wouldn't surprise me if I'm jumping 100 thou or more.

 

[317millhand]

I haven't measured it, but it's a LOT. Bought the barrel from someone else who had it throated to single feed F-Class in a short action. I think maybe long enough for it to keep the bullet bearing surface above neck/shoulder junction.

Wouldn't surprise me if I'm jumping 100 thou or more.

I had one that was jumping about .300 and shot better than any other chamber I've tried. So I'm always curious of everyone's chamber especially with 180 eld_m

 

[tomcatfan]

I have to single feed my 7 SAUM in a short action Nucleus with the 180 eld. I got a shouldered prefit from PVA, but I'm not sure what chamber he uses. If I were to mag feed from an ARC magazine, I was getting a silly amount of jump and terrible accuracy, between 0.8-1.6 MOA. Single feeding with about a 0.02" jump I can get about 0.5 MOA. It's a project I put together to try my luck at a mile, so single feeding doesn't bother me.

 

[99106]

175 ELD-X
Fed 210M
H4350
Norma brass
.005 jump 24" Proof barrel

I tried H4831 based on my 6.5-06 experiences and could not get the velocity I wanted out of a 24" barrel. Based on several "internet experts" I decided to try H1000 later since I wanted the gun up and running for hunting season. In parallel I tested what my gunsmith suggested which was H4350. Another conversation at a TBAC suppressor demo has me wanting to test RL17, but in reality H4350 is less powder, I use it in other calibers and it just works. Also it's consistent and well under an MOA if I do my part.

 

[Steel head]

Some more numbers from today
H1000
Adg brass.
180 eldm’s @2.95 it cci#200’s

63.5 2895 sd 10
64.0 2908 sd 5
64.5 2935 sd 11
All three shot within 5/8 with 5 shots.

IMR7977
63.5 2847
64.0 2884
64.5 2940
65.0 2958
these were just single shot readings.
some AK clowns showed up and I didn’t want to be around them any longer.

absolutely no pressure signs at all.
I’m going to investigate the 64 grains of H1000 load more closely.

 

[350 Mag]

Rem 700 S/A
McMillian A3
Burris Eliminator 3
Rem Brass
CCi-BR2
175 gr Eld-X(.oo5 off lands)
64.5 gr H-1000( pretty close to max @ 65.2 I had sticky extraction and tight bolt lift and primer pocket was loose)
24" Krieger 1 in 9.5"
2940-2957

Using Strelok Pro I was able to program perfect drop for Burris. Score 3 for 3 shots on gong @ 608 yards.

I hope they release an Eliminator in higher quality glass.

These really aren't target scopes and at 600 yards I find the stadia thick...so liking this group size.

3.9" @ 617 yards.

 

[jafo96]

Some more numbers from today
H1000
Adg brass.
180 eldm’s @2.95 it cci#200’s

63.5 2895 sd 10
64.0 2908 sd 5
64.5 2935 sd 11
All three shot within 5/8 with 5 shots.

IMR7977
63.5 2847
64.0 2884
64.5 2940
65.0 2958
these were just single shot readings.
some AK clowns showed up and I didn’t want to be around them any longer.

absolutely no pressure signs at all.
I’m going to investigate the 64 grains of H1000 load more closely.

Are your H1000 loads compressed?

 

[350 Mag]

Hey can anyone with Quickload run numbers for H1000 and 175 Eld-X and 180 Berger?

I noticed some of my brass at 64.5 load had some faint "smileys".

This was virgin Rem brass full length sized brass.

I am going to bump the should back and size neck with Lee Collett.

Going to back off a full grain and work up to 64.5. after 1st firing.

Primer pockets on 64.5 gr load seem just as tight as factory case.

Loads at 65 and above had stuff bolt lift and pockets were noticable loose.

 

[Steel head]

Are your H1000 loads compressed?

yes.

barrel sped up a lot so now to get 2900 with 180’s load is now not compressed. It just barely pushes on powder which I think is perfect.

2900ish with H1000 and 7977 really shoots well with low SD so I’m staying there.
I did get to a bit below 3000 before I had pressure starting to show.

 

[350 Mag]

From Hodgdon reloading data...65.5 C is their max load for 175gr.

 

[Steel head]

From Hodgdon reloading data...65.5 C is their max load for 175gr.View attachment 7173240

I got to 64.5 of H1000 loaded long.
No way I’d get it in at mag length.
Velocity was 2940 but that was well before the barrel sped up so it would be 3000ish now.

 

[350 Mag]

I got to 64.5 of H1000 loaded long.
No way I’d get it in at mag length.
Velocity was 2940 but that was well before the barrel sped up so it would be 3000ish now.

I have 700 S/A throated for 180 Berger.

Seekins WSM bottom metal allows to seat bullets out to lands and still function in magazine.

I actually found 175 gr ELDx load because I wasn't happy with feeding of Berger VLDs.

Eld-X feeds perfect except for last round.