Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Post any issues in the thread below or reach out directly to support!
View thread Contact supportWhat brass? Because there's a world of difference between Lake City and Winchester brass.Using sierra 155s I have Ar Comp and Varget. GRT showing Varget would be a little less pressure and more velocity. Any idea where to start with a gas gun? Looking at 45ish gr of Varget and 43ish gr of AR COMP.
Federal brassWhat brass? Because there's a world of difference between Lake City and Winchester brass.
For Varget, Hodgdon's .308 Service Rifle data shows a starting load of 43.0 and 44.0 max charge.
IME gas guns are just different and won't handle the same charges as your bolt guns. The service rifle data is geared more toward the M1 and M14 rifles... But probably a good place to start with an AR-10/.308
Can't help you with AR-Comp. But I bet someone else can chime in.
Mike
I have loaded 46-47 with 155s in a bolt gun figured 45 would be ok, maybe I'll start lowerI think 45gr Varget is top end; wouldn't start there. Not sure if that's what you meant. I topped out at 43.5gr in LC brass as previously mentioned. Varget is kinda slow honestly. I tried StaBall Match yesterday. 47gr was the max I could fit in a case. Book max is 48.7(C)
Are you shooting that staball match load in a gas gun? What bullet, and group size? I've got a few pounds of the staball match that I'd like to try under 175-178 gr a-max's or eldm's.I think 45gr Varget is top end; wouldn't start there. Not sure if that's what you meant. I topped out at 43.5gr in LC brass as previously mentioned. Varget is kinda slow honestly. I tried StaBall Match yesterday. 47gr was the max I could fit in a case. Book max is 48.7(C)
Yes. 155gr SMKs. I should caveat that I'm using LC brass so I don't think I got full utility out of it. If you look at Hodgdon's load data StaBall Match provides some of the highest velocities but I wasn't able to fit the book max in the case. I loaded 46.5gr and 47gr. 46.5 shot about .7" and 26-something fps. About like Varget. 47 was definitely compressed and it showed. The group opened up and SDs where all over the place. It's kind of like StaBall 6.5. That powder needs to be close to 100% fill for accuracy and good SDs. But it gets wild when compressed.Are you shooting that staball match load in a gas gun? What bullet, and group size? I've got a few pounds of the staball match that I'd like to try under 175-178 gr a-max's or eldm's.
...some pressure test results I obtained. Brass was assorted year LC. Environment is tropical island, avg year round temp ~85F, Relative humidity ranges from 65-80% during daylight hours to 85-100% at night. AR-10 build w/16" CLGS tube & SLR AGB, standard carbine buffer system. YMMVUsing sierra 155s I have Ar Comp and Varget. GRT showing Varget would be a little less pressure and more velocity. Any idea where to start with a gas gun? Looking at 45ish gr of Varget and 43ish gr of AR COMP.
I like the sound of that..308 16" 1:11.25 (Seekins)
125gr Speer TNT
Starline SRP brass
CCI 450
50.0gr 8208 XBR
3030 fps
Very accurate, but I don't measure groups with this gun as it wears a thermal 100% of the time. Extremely effective on hogs and yotes.
These 5-shot groups are from a 16” bolt gun. 1:11 twist.Has anyone used Tac with 150-155 gr stuff? Looks like I might get more velocity with Varget but not sure.
Any pressure signs on the top load??These 5-shot groups are from a 16” bolt gun. 1:11 twist.
Peterson SRP, CCI450, Berger 155 VLD, Ramshot TAC
Grains - Avg FPS, SD, ES
44.4 - 2654, 10.6, 26.5
44.7 - 2677, 13.7, 42.0
45.0 - 2687, 10.5, 26.0
45.3 - 2704, 9.1, 25.0
45.6 - 2733, 1.7, 4.0, (4 shot group)
All the groups were sub-MOA but the first one was one hole.
Factory Federal GM 155gr SMK ran at 2600 fps from the same barrel.
Nope. I’m gonna load some more at the low end and top end and see if results are reproduced. Shot this last week.Any pressure signs on the top load??
I use 45.5 in LC brass with 155 eldm’s. It’s my go to powder with that weight bullet actuallyHas anyone used Tac with 150-155 gr stuff? Looks like I might get more velocity with Varget but not sure.
Just finished my 16" 8T Poor-arue build and have some 155TMK's on the way. Was already thinking Tac. Hopefully I'll make it to the range next weekend. Might try some 174 VT's for kicksNope. I’m gonna load some more at the low end and top end and see if results are reproduced. Shot this last week.
Gas gun? How is the brass?I use 45.5 in LC brass with 155 eldm’s. It’s my go to powder with that weight bullet actually
These 5-shot groups are from a 16” bolt gun. 1:11 twist.
Peterson SRP, CCI450, Berger 155 VLD, Ramshot TAC
Grains - Avg FPS, SD, ES
44.4 - 2654, 10.6, 26.5
44.7 - 2677, 13.7, 42.0
45.0 - 2687, 10.5, 26.0
45.3 - 2704, 9.1, 25.0
45.6 - 2733, 1.7, 4.0, (4 shot group)
All the groups were sub-MOA but the first one was one hole.
Factory Federal GM 155gr SMK ran at 2600 fps from the same barrel.
Yep and those will probably need the crimp removed from the primer pocket. FL size and bump shoulder back .002-.004 from fired brass dimension. I bump less for bolt guns.How would you guys size once fired LC bought online? Decap and check shoulder measurement compared to brass fired in your gun?
Some LC brass you can get online was fired from M-60 /M-249's which just means that the 308 brass will have been fired in not so very tight chambers.How would you guys size once fired LC bought online? Decap and check shoulder measurement compared to brass fired in your gun?
^^^^^^^Some LC brass you can get online was fired from M-60 /M-249's which just means that the 308 brass will have been fired in not so very tight chambers.
Back when I was feeding an M1A I got some 308 brass and it took two attempts to finally get them FL resized. I would suggest looking O/L for ; LCLR or any factory brass , watch the classifieds for 1x 308 brass