6mmAR load data

[K_4c]

Didn't see anything in the reloading depot...

Did some initial load testing with 105 hybrids and 75 grain vmax...

20" 1:7 twist
Powder IMR 8208 xbr
primmer: cci 450
brass: Hornady

28.5 grains/75 grain vmax/ 2960 FPS (no pressure)
29 grains/75 grain vmax/ 3030 fps (no pressure)
27.5 grains/105 hybrids/2705 FPS (case swipe)
28.0 grains/105 hybrids/2735 (case swipe)

Picked up 1# of RL15 and AA2520.
projectiles: 85 hpbt's, 105 RDF's and 105 hybrids

Anybody got any data to share?

 

[K_4c]

May try some varget as RL15 and varget are very similar on the burn chart...

 

[K_4c]

Update for anyone that is interested.

I'm loading RL15 with 105 RDF's and 85 smks...
Also AA2520 with the same projectiles.

Starting at 27.5 for both powders with 105's and 28.0 grains for AA2520 with 85 smks.

 

[steve123]

Do yourself a huge favor and ditch the temp sensitive powders, especially the 2520! I worked up a load in summer with the 2520 and was missing low off a 10" plate at 400Y in the winter. I thought my scope was broke, seriously. Nope 140 fps was lost due to 80-90 degree temps vs 20-30 degree, which is just stupid.

All you need is H4895 which is perfect for this case.

 

[TonyTheTiger]

How are the RDF's doing? And what barrel are you running?

 

[K_4c]

Do yourself a huge favor and ditch the temp sensitive powders, especially the 2520! I worked up a load in summer with the 2520 and was missing low on a 10" plate at 400Y in the winter. I thought my scope was broke, seriously. Nope 140 fps was lost due to 80-90 degree temps vs 20-30 degree, which is just stupid.

All you need is H4895 which is perfect for this case.

What's your load data on h4895?

Appreciate the heads up on AA2520.

 

[K_4c]

How are the RDF's doing? And what barrel are you running?

Hopefully get out tomorrow. I don't see an issue hitting 2700-2750 FPS with the RDF's and RL15.

Barrel is a 20" McGowen 1:7

 

[steve123]

What's your load data on h4895?

Appreciate the heads up on AA2520.

I don't remember the exact load but it was around 2700 fps with a 105 hybrid out of a 20", probably in the 27-27.5 grains region. I went to 6mmFatRat shortly afterwards because that particular 6mmAR barrel was shot out.

Varget is too slow of a powder for the case, it's too slow for the improved versions as well.

I found that the 95 SMK, which is now a pointed meplat, shoots really well in my Fatty and I find it a better fit than the 105's for these sub 30gr charges. Using the 95 instead adds 90-100 fps, even though it has less BC it's being driven faster so it drifts approx the same amount in the wind. The 95 TMK would be superior with it's slightly higher BC, as long as it shoots as good as the SMK does.

 

[K_4c]

I agree on the 95smks/tmks being the preferred projectile and intend on going that way. Just made an impulse buy at a local gun store to pick up the 85 smks.

I prefer to keep the 6mm Grendel load cheap and considered the 105 match burners as a possible bullet to buy in bulk ($27 per 100).

ideally I want less then a mil drop out to 300 (coyote gun), but I think a 22 Grendel will fulfill that need.

 

[K_4c]

Interesting that varget is to slow... my dasher runs 2980 FPS with 32.9 grains/105 hybrids/26" tube.

rl15 is 99 on the burn chart with varget at 101.

 

[steve123]

Interesting that varget is to slow... my dasher runs 2980 FPS with 32.9 grains/105 hybrids/26" tube.

rl15 is 99 on the burn chart with varget at 101.

Yes I know, one wouldn't think so but the trick is to find the ideal powder for "a" cartridge case. Varget is a very good powder for many. It's my go-to for most of my old military rifles. I could use it in my 6x47l and it would work great probably but because my current barrel is 28" I choose to use a slower powder.

H4895 works well in the Dasher too but Varget is about the perfect burn rate for the BR's. In the AR you'll be constrained by mag length of 2.260 max with Cmags and I usually run mine at 2.245. What happens with varget is you can't stuff enough of it in to get good speed even though it will go bang. The Dasher COAL is much longer and like with your load holds about 5 grains more powder than the 6mmAR.

I have the exact thing going on with my 6x47L, I can't stuff enough H1000 into it to get decent speed and extreme spreads are poor. But with H4831SC, which is slightly faster burning and not as bulky, a compressed charge of it will crank speeds with low ES. H1000 works well in a 243 because it has a little more powder capacity.

 

[Ledzep]

What's the best powder to run with the heavier pills (temp sensitive and high velocity)? I'm waiting on a barrel order (2 more months probably) to build a 24" 6mmAR, want to run 110 SMK's. This is a Cz527, not an AR so 2.330" mag length. Can't wait to get things rolling with this little project.

 

[shanem81]

I have had great luck with cfe223 in the 243 lbc with the heavies. I have not had a chance to test the temp sensitivity on any loads yet so no help there. The 95 Tmks are right at 3000 and 105 bergers are at 2770 with the cfe223.

 

[bigjake83]

What's the best powder to run with the heavier pills (temp sensitive and high velocity)? I'm waiting on a barrel order (2 more months probably) to build a 24" 6mmAR, want to run 110 SMK's. This is a Cz527, not an AR so 2.330" mag length. Can't wait to get things rolling with this little project.

H4895, R15

And I've also been working with RamShot Tac and its showing some promise.

 

[K_4c]

I made it out...

105 RDF's/28.1 grains RL15/2620 FPS (slight case swipe, primer is perfect) 1 moa pretty consistently

85 smk/28.8 grains RL15/2780 FPS (no pressure) .5-.7 moa.

I'm done with the 105 class projectiles. 85-95 class projectiles are what I'll load for here on out.

Regarding Varget, my AXMC/6xc loves it. 37 grains pushes the hybrids to 3070, no pressure and consistent SD's (under 10).

 

[K_4c]

I have had great luck with cfe223 in the 243 lbc with the heavies. I have not had a chance to test the temp sensitivity on any loads yet so no help there. The 95 Tmks are right at 3000 and 105 bergers are at 2770 with the cfe223.

How long of a barrel?

 

[shanem81]

22” bhw barrel

 

[mason.ostrom]

27gr of reloder 15 in Norma brass with a 107smk and wolf sr primer. 22" BHW 243 LBC Barrel with a silencerco specwar 7.62. Have shot groups in the .2s (admittedly very few) but it consistently shoots .75 MOA.

 

[K_4c]

85 smks, shoot just fine... may use them on coyotes.

 

[steve123]

What's the best powder to run with the heavier pills (temp sensitive and high velocity)? I'm waiting on a barrel order (2 more months probably) to build a 24" 6mmAR, want to run 110 SMK's. This is a Cz527, not an AR so 2.330" mag length. Can't wait to get things rolling with this little project.

Did you mean temp "insensitive"? 8208 XBR and IMR 4166 might be worth a try, besides the others I mentioned. I used R15 for fireforming in the FatRat but I had 7 pounds of it is why. You get slightly higher fps but I would rather use H4895 for a formed case.

 

[Ledzep]

Yes, I did mean insensitive. I had picked up a 1lb can of CFE 223 to try out because I've read around that velocity is really good but I've since learned it's pretty touchy with temp changes. I get the whole range from below 0 to 100+ and would prefer to have one, maybe 2 loads, not one or every 25 degree increment. I'm hoping to get at least 2650 fps at an accuracy node without too much pressure.

I'll probably still try out the CFE and see how much velocity I lose (load dev in the summer and see how it does from there), but it's a lot easier when it doesn't fluctuate so much.

 

[Yondering]

I have had great luck with cfe223 in the 243 lbc with the heavies. I have not had a chance to test the temp sensitivity on any loads yet so no help there. The 95 Tmks are right at 3000 and 105 bergers are at 2770 with the cfe223.

CFE223 works very well in my 24" 243 LBC as well. I'm using the 95gr Berger VLD with excellent results.

 

[Rangemaster]

Yes, I did mean insensitive. I had picked up a 1lb can of CFE 223 to try out because I've read around that velocity is really good but I've since learned it's pretty touchy with temp changes. I get the whole range from below 0 to 100+ and would prefer to have one, maybe 2 loads, not one or every 25 degree increment. I'm hoping to get at least 2650 fps at an accuracy node without too much pressure.

I'll probably still try out the CFE and see how much velocity I lose (load dev in the summer and see how it does from there), but it's a lot easier when it doesn't fluctuate so much.

This is my powder of choice, meters real good. I am getting 2660 with 30.5gr cfe223, shoots one holers at 100 yards.

 

[Ledzep]

Rangemaster, what length of barrel are you running?

 

[Rangemaster]

Rangemaster, what length of barrel are you running?

I have two of them, one with a 20" and one with a 26" barrel.
the longer barrel shoots right at 2770 fps vs 2660 fps on the 20" barrel.

 

[fx77]

Probably U have already viewed this forum for 6mmAR

​​​​​​http://6mmar.com/6mm_AR_Loading_Info.html

 

[K_4c]

Probably U have already viewed this forum for 6mmAR

​​​​​​http://6mmar.com/6mm_AR_Loading_Info.html

Yes sir. I'm on my final venture with the 6mm Grendel... I'm running with 95 smks over 8208 or h4895.. if I can hit 2750+ FPS with no pressure issues, shoots well and is reliable.... Then building a 6mmAR was a good decision.

 

[Yondering]

Yes sir. I'm on my final venture with the 6mm Grendel... I'm running with 95 smks over 8208 or h4895.. if I can hit 2750+ FPS with no pressure issues, shoots well and is reliable.... Then building a 6mmAR was a good decision.

What barrel length? If it's 20" or longer, 2750 fps is a pretty low target; you should be able to get close to 3000 fps with 95s.

 

[K_4c]

What barrel length? If it's 20" or longer, 2750 fps is a pretty low target; you should be able to get close to 3000 fps with 95s.

I don't see 3k with 95's out of a 20" tube (which is what I'm running)... I pushed the 75 vmaxs to 3030 and the 85 bthp's to 2810 FPS with RL15... hit pressure with 105's at 2705 FPS.

 

[Yondering]

Try different powders then; 3,000 or close to it is very attainable, at least 2900 even with a 20" barrel. CFE223 is one example.

 

[K_4c]

I've tried RL15, 8208, h4895, and AA2520.... I'm sticking with temp stable powders (h4895 and 8208). Ball powder may meter well, but the consistency (temp) isn't there imo...

 

[Yondering]

Try it for yourself with CFE223 and TAC. Don't bother with 2520. Temp stability tends to be overblown online, and it does vary with different loads in different cartridges. Your choice if you want to give up 250+ fps, but you did come here looking for suggestions...

 

[Cody S]

I wonder if varget would work good with the 6mm ar turbo or the 224 ar turbo

 

[K_4c]

Try it for yourself with CFE223 and TAC. Don't bother with 2520. Temp stability tends to be overblown online, and it does vary with different loads in different cartridges. Your choice if you want to give up 250+ fps, but you did come here looking for suggestions...

I've used cfe223 in 6.5 Grendel, 5.56 and .308. I agree that it brings a bit more MV, but I'm more concerned with consistency, which I have personally witnessed. I believe I got a slow barrel, accurate, but slow... I'll load up 10 tonight and see what I get.

 

[Rangemaster]

Why are so many people worried about speed? I go by how accurate the load is from 100 to 850 yards. I will put my Fat Rat up against any bolt rifle, one good thing I enjoy in the matches is I can see all the bullet strikes and misses. These guns have almost no recoil with using a adjustable gas block and a silent capture spring.

 

[K_4c]

300 yards. 95 smks loaded with various charge weights to check vertical dispersion. 300 is not be enough to really tell the tale. Limited on time and land.

Dope on gun- 1 mil/.7 wind (14 mph wind)

27.5 h4895- 2761 FPS SD 5/ Es 13
28.0 h4895- 2801 FPS SD 5.3/ Es 13
27.5 8208- 2730 FPS 5.9 SD/ Es 13
27.7 8208- 2746 FPS 14 SD/Es 38
28.0 8208- 2780 FPS 12.4 SD/ Es 33
28.5 8208- 2816 FPS 7 SD/ Es 18

 

[K_4c]

Why are so many people worried about speed? I go by how accurate the load is from 100 to 850 yards. I will put my Fat Rat up against any bolt rifle, one good thing I enjoy in the matches is I can see all the bullet strikes and misses. These guns have almost no recoil with using a adjustable gas block and a silent capture spring.

I agree. A 6.5x47 is no speed demon but is a great cartridge. Most the team AI shooters run 140's at a modest 2700 FPS. I'll take a consistent load over an erratic speed demon any day.

 

[bigjake83]

Who made your Barrel?? And what brand is the blank?

 

[K_4c]

Who made your Barrel?? And what brand is the blank?

McGowen Custom


http://mcgowenbarrel.com/shop/custom-ar-barrel/#

 

[bigjake83]

McGowen Custom


http://mcgowenbarrel.com/shop/custom-ar-barrel/#

Ever think maybe it's your barrel??

 

[K_4c]

Ever think maybe it's your barrel??

Missed your point? What's my barrel?

Because it's a slow(er) barrel then what others are posting?

Of course it's the barrel, which I stated above. Slow but fairly accurate. Same barrels Scott from Specialized Dynamics uses.

 

[david walter]

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