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usmc1974

Bolt vs Gas ammo.

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Posted (edited)

I was wondering, do you guys run your gas  gun ammo hot as your bolt guns?

Edited by usmc1974

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Accuracy is the key, not how fast it's going. 

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Aren't there issues with burn rates and certain operating systems?

Sent from my Nexus 5X using Tapatalk

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The M1A has a burn rate/bullet weight range that is recommended (some powders even say they are in the M1A burn rate range...maybe it is just marketing?). 

Never heard or seen the same thing for the AR platforms.

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2 hours ago, JimmyZip said:

Aren't there issues with burn rates and certain operating systems?

Sent from my Nexus 5X using Tapatalk
 

I do know that the old rule of thumb was nothing slower than 4064 in a Garand.

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1 minute ago, Dan Sierpina said:

I do know that the old rule of thumb was nothing slower than 4064 in a Garand.

the common saying for garands is nothing faster than IMR 3031 and nothing slower than IMR 4320.  Anything outside of these ranges could result in bent oprods.

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Burt,

 

  Hello, usually you can run a hotter load in a bolt gun of the same caliber than you can a gas gun.  If your bolt gun load is pretty hot and you try it in a gas gun you may start blowing primers in the gas gun unless you have some way of delaying the bolt opening in the gas gun until the pressure drops some, (pigtail gas tube, reducing the gas with a variable block, etc.).  I ran into this with some factory 6.5 CM ammo that worked fine in a bolt gun but same lot occasionally popped primers in a gas gun and had ejector swipes etc.  Same with hand-loads you can usually run hotter in a bolt gun than a gas gun.

  Hope this helps.

 

  Jeff

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I don't. I'm using Hornady 178gr BTHPs in both my Larue 7.62 Predatar and Sako TRG and I'm at 1.5gr less Varget with the AR10 (42.9gr vs 44.4gr). I was starting to get significant pressure signs above 43.2gr in my Larue. 

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