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6mm choice

B

Bluejazz

Sergeant
Full Member
Minuteman
Jun 8, 2009
862
5
64
IOWA
#1
Looking to run the 115DTac or 105 Bergers out of AW mags.
Been looking at the 6SLR or the 6 Crusader, and some othe 6 mm choices.
What calipers are you guys using to push the 115gr bullets, and will a 7.5 twist barrel tear up the bullets?
 
#2
Jazz
If you don't mind fireforming cases the 6 Dasher is the cartridge of choice for 600/1000 yard benchrest shooting.Its short length is a plus for seating the bullets long in a short action.It only burns 33+ grains of powder and will push the 115 weight bullets with a 8 twist barrel.Low recoil very long case life and better accuracy than any other longrange 6mm are tough to beat.
The barrels twist rate has very little to do with tearing up bullets.Heat from friction is the major culprit in bullet blow-ups.I was pushing 100-108 class bullets at 3425 fps with my 6mm-06 and have never had a problem with a 8 twist barrel.I tried the older Berger 115's and only 1 bullet out of 40 made it to the target.The long bearing surface of the bullet at high velocity and a 30 inch barrel was more than they could handle.
Lynn
 
#3
My choice is the 6mm Creedmoor. Do a search on it, you might find it will be your choice as well. There are several good 6mm cartridges, but not all come with factory brass, or the ability to feed well from a magazine.
 
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#8
Good ole .243......it's not new and doesn't have a cool "X" in it's name, but it more than gets the job done. I'm running a 26" barrel in 1:7.5 tw. It's shooting the 115Dtacs right at 3,009fps with 44gr of H4831SC. Great factory Lapua brass as well. Takes 7.4mils to 1000.

I will admit I do want to try a 6XC, but not because I really feel like its going to do anything better than my .243 will. I'm sure it's just as good, but I doubt any better.
 
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#10
trevor300wsm said:
Good ole .243......it's not new and doesn't have a cool "X" in it's name, but it more than gets the job done. I'm running a 26" barrel in 1:7.5 tw. It's shooting the 115Dtacs right at 3,009fps with 44gr of H4831SC. Great factory Lapua brass as well. Takes 7.4mils to 1000.
Click to expand...

What's your barrel life on the "good ole .243?" Just curious...not trying to piss you off.
 
#16
I had a 6 Creedmoor made last year, having my 6mmREM rebarreled in the same 6 Creedmoor with a slight adjustment in the chamber this year, and I dont even know how the first one is going to shoot, Im a trusting soul, arent I? The shell on the left is a 22-250 case ran thru my 6Creed die ready for forming.
<a href="http://s1113.photobucket.com/user/JGorski80/media/IMG_0775.jpg.html" target="_blank"><img src="http://i1113.photobucket.com/albums/k513/JGorski80/IMG_0775.jpg" border="0" alt=" photo IMG_0775.jpg"/></a>
 
#17
Before you make a decision, you would be well served to confirm that your choice will ACTUALLY FEED out of an AW magazine. For example, .243, no problem. .243 Ackley...no dice. The AW magazine has a rib pressed into the side of the mag body that smacks into the shoulder of the Ackley case...which may or may not do the same with one of the other 6mm choices.
 
#20
JDUBYA said:
You can make the Dashers, BR's, Ackley's feed out of AI mags but it will take modification. I would go with the 6xc or 6CM which are very similar. They will feed great, get the velocity, and be easy to tune.
Click to expand...

AICS or AW magazines? OP wants to use the latter. I would really like to see an AW magazine properly modified to feed .243 ackley.
 
#21
Thanks for all the replies. Keep them coming.
I have a few additional questions.
Anyone having trouble dusting Berger bullets at 3300fps?
Also, it would be helpful to find out what COAL is and FPS of each caliber with the 105 or 115's.
Are there issues with having to chase the lands, and then not being able to fit in the AW mags?
Just read about a gain twist barrel, any advantage to going this route to help keep bullets from falling apart?
 
#22
19Scout77 said:
Before you make a decision, you would be well served to confirm that your choice will ACTUALLY FEED out of an AW magazine. For example, .243, no problem. .243 Ackley...no dice. The AW magazine has a rib pressed into the side of the mag body that smacks into the shoulder of the Ackley case...which may or may not do the same with one of the other 6mm choices.
Click to expand...

This is a very valid point, and one of the reasons I chose the SLR (albeit in 6.5mm and/or 7mm...tooling on order, but not sure which I'll try first). The shoulder arranges itself nicely with the rib in the AW magazine, and the 30º shoulder is proven good to go in these magazines as well.
 
#24
I shoot both SLR and Creedmoors from AW Mags. Zero issues...

turbo54 said:
This is a very valid point, and one of the reasons I chose the SLR (albeit in 6.5mm and/or 7mm...tooling on order, but not sure which I'll try first). The shoulder arranges itself nicely with the rib in the AW magazine, and the 30º shoulder is proven good to go in these magazines as well.
Click to expand...
 
#25
I currently shoot and love the 6 XC, However if I were starting over again I could pick between either a 6 creed or 6-6.5x47

To me the norma xc isnt worth $88/100 I think the lapua 47 brass would be a better investment and if annealed and collected after matches would provide excellent brass life, some report 20 firing, buy a reamer and keep the barrels coming

but if you want to save money on brass or are worried about loosing brass then i would go 6 creed in a heart beat, both are great.

Both burn less powder than a 243 and from what i have owned and shot and those who i have talked to that i value thier opinion are easier to tune and shoot bug holes
 
#28
trevor300wsm said:
Good ole .243......it's not new and doesn't have a cool "X" in it's name, but it more than gets the job done. I'm running a 26" barrel in 1:7.5 tw. It's shooting the 115Dtacs right at 3,009fps with 44gr of H4831SC. Great factory Lapua brass as well. Takes 7.4mils to 1000.

I will admit I do want to try a 6XC, but not because I really feel like its going to do anything better than my .243 will. I'm sure it's just as good, but I doubt any better.
Click to expand...

I agree, the old reliable 243 is easy, but if your like me you'll have to rebarrel in 1500 rounds so you can change it up in a few months! I have friends that shoot the 6CM and the 6x47 and they shoot very well and are a little more efficient than my 243. But choices are good!
 
#29
I went with a 6SLR last year and i really am pleased with the performance. I'm shooting the 105g Bergers and 105g Amax at 3150fps out of a 24" barrel.

I have no regrets at all!

It would be hard to choose between the 6SLR and the 6CM right now. But i think for ease of cases the 6SLR is a no brainer.

xdeano
 
#30
Looking toward the 6 Creed, but don't find brass availability.
Also, not sure if there are coal issues with the 6 SLR or 6CM with the 115 Bergers and AW mags.
 
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#33
Can anyone list the H2O case size for each of the 6mm cases??

My guess:

6 Rem > 6 Competition Match > 6 SLR > 243 > 6 Creedmore > 6x47 Lapua > 6 XC > 6 Dasher


On the fence with a 6 build and either a 243 or 6xc. Prob go 243 for brass cost alone (lose a lot of brass in matches) but ccant decide. I also want a larger capacity case to utilize a slower poweder like H1000 which chould make barrel last longer. On paper at least :)

Thanks,
DT
 
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#34
you just don't hear much anymore about the .243 WSM or its shorter fatter brother the .243 WSSM.....have they all but faded off into obscurity? I guess I'm not asking if they will fit and feed from AICS or AW mags....just in general, I rarely see threads discussing them being used for builds or guys reloading for current rifles, wonder what happened?
 
#35
D_TROS said:
Can anyone list the H2O case size for each of the 6mm cases??

My guess:

6 Rem > 6 Competition Match > 6 SLR > 243 > 6 Creedmore > 6x47 Lapua > 6 XC > 6 Dasher


On the fence with a 6 build and either a 243 or 6xc. Prob go 243 for brass cost alone (lose a lot of brass in matches) but ccant decide. I also want a larger capacity case to utilize a slower poweder like H1000 which chould make barrel last longer. On paper at least :)

Thanks,
DT
Click to expand...

6mmREM hold 56.2, 6 Creed 51.5, 6XC about 50grs H2O.
 
#38
D_TROS said:
Can anyone list the H2O case size for each of the 6mm cases??

My guess:

6 Rem > 6 Competition Match > 6 SLR > 243 > 6 Creedmore > 6x47 Lapua > 6 XC > 6 Dasher


On the fence with a 6 build and either a 243 or 6xc. Prob go 243 for brass cost alone (lose a lot of brass in matches) but ccant decide. I also want a larger capacity case to utilize a slower poweder like H1000 which chould make barrel last longer. On paper at least :)

Thanks,
DT
Click to expand...
6XC > 6x47. Everything else looks right.
 
#39
Love my 6x47 lapua. Easy to neck down. I've also had 6br and brx and they were very accurate. I just didn't want to fire form any more. 6br is a great. I know guys with the 6xc and its accurate too. Not knocking 243win but the barrel life is way to short for me.
 
#40
6 competition match. Run case through sizing die, cci br2/fed210m, 47g h1000, seat bullet.....shoot. FF loads are accurate. No waste of components. Win brass, 3500+ rounds, accurate. I have 2-243's, 243AI & 6CM... All are accurate and fast,faster & fastest. You really can't go wrong with any of the cartridges mentioned in this thread. It boils down to if it feeds from mag & whether or not you like/mind FF brass. Call a good smith & ask them your questions. Chad Dixon, Greg Young, Dave Bruno, Robert Whitley will answer the phone or return your call. Be careful, they are also good salesmen! All these guys are also shooters, they will tell you what works
 
#41
PSYOPS said:
What's your barrel life on the "good ole .243?" Just curious...not trying to piss you off.
Click to expand...

I'm 3 matches into this barrel and the round count is at 609. It was Melonite treated and I'm shooting 4831SC (opposed to 4350) so I'm hoping to get close to 1700-1800 out of it. That might be a bit optimistic.
 
#42
I too am waiting on a 6mm Creedmoor. At first, I was going to go with the 6XC, but after some advice, I chose the 6 Creedmoor. I just wish there was a bit more info on the caliber, but from what I have read and been told, it's an easy to load accurate caliber that does not burn the barrel as quickly as other 6mm. I plan to use this rifle for tactical competitions.
 
#46
Bluejazz said:
Thanks for all the replies. Keep them coming.
I have a few additional questions.
Anyone having trouble dusting Berger bullets at 3300fps?
Also, it would be helpful to find out what COAL is and FPS of each caliber with the 105 or 115's.
Are there issues with having to chase the lands, and then not being able to fit in the AW mags?
Just read about a gain twist barrel, any advantage to going this route to help keep bullets from falling apart?
Click to expand...

BlueJazz
Cartridge overall length on the 6Dasher is 2.405 inches with a Spencer 103 gr VLD with the meplats trimmed.The velocity is 3045 fps and all of the 100-108 grain match bullets work in the 3025-3050 fps range with this case.Barrel life comes down to how much heat you are forcing down the bore and the Dasher burns 33 grains of powder.The same velocity out of the larger cases requires around 43 grains or more of powder and thus less barrel life.Feeding is not a problem.
Fireforming brass is the only pain with the Dasher but even that is no big deal.
Accuracy is everything in my book and for that nothing beats the Dasher.
On the bullet blow-ups you will not see them anymore as Berger has changed there jackets to accommodate the higher velocity and higher friction of the bigger cartridges and longer barrels.
I would recommend you use there hunting bullets and only switch to the thicker jackets if you are seeing blow-ups.The thinner jackets on the hunting bullets have a higher bc number and tend to outshoot the thicker jackets.
There is a huge amount of truth to the comment that some of these manufacturers are great at selling you stuff.
In a nutshell for a short action the 6BR is running 30 grains of powder and getting 2900+ fps and the 6-284 is running 54 grains of powder and getting 3425fps.Everything else fills in the center section.
In my opinion accuracy long barrel life and good brass trumps the rest.
I take my old 6BR and 6Dasher barrels off and turn them into 6/284 or 6mm-06's barrels for hunting.
Lynn
 
#47
My water case capacity for the 6SLR is 54.4grn average. Remember that the bullet will fill some of this space also.

I know i can stuff 47.4grn of H1000 into the case for a slow but accurate @ 3000fps. Or 46.5grn of my blended powder for 3155fps with a 105 berger. I can easily go above that velocity and hit 3200fps.

I like running the H1000 in this case just because it should slow down throat erosion.

xdeano
 
#49
Lynn Jr said:
BlueJazz
Cartridge overall length on the 6Dasher is 2.405 inches with a Spencer 103 gr VLD with the meplats trimmed.The velocity is 3045 fps and all of the 100-108 grain match bullets work in the 3025-3050 fps range with this case.Barrel life comes down to how much heat you are forcing down the bore and the Dasher burns 33 grains of powder.The same velocity out of the larger cases requires around 43 grains or more of powder and thus less barrel life.Feeding is not a problem.
Lynn
Click to expand...

I figure I should be getting just over 3200 from 42grs of powder in my 6 Creed, that might be a huge plus when shooting to 600-1K.
 
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