Alright, gas operated .308 guns with 18" barrels. One AR10 clone and an M1A. H335 pushing a 147gr/150gr bullet. Let's discuss the former b/c it has no muzzle brake/flash hider to disguise muzzle blast.
At 42.0gr H335 there is noticeable blast/fireball at the muzzle. 41.5 does not have such blast and averaged 2567fps for five shots giving about 1.5" @100. Velocity @ 42.0gr was 2604fps.
Please realize that this is more a theoretical question than trying to make a match gun from a hunting rifle, but:
1.) Am I giving up any consistency due to pressure loading several grains below the maximum? (I know this assumes that the higher the pressure the better consistency which seems to be valid in most cases I've seen.)
2.) Is there anything to gain from dealing with muzzle blast vs. loading low enough to avoid it?
3.) I am familiar with loading for the M-1, but are there any ways to get into trouble with the open gas systems of the AR10(DI) and M1A(self regulating)?
At 42.0gr H335 there is noticeable blast/fireball at the muzzle. 41.5 does not have such blast and averaged 2567fps for five shots giving about 1.5" @100. Velocity @ 42.0gr was 2604fps.
Please realize that this is more a theoretical question than trying to make a match gun from a hunting rifle, but:
1.) Am I giving up any consistency due to pressure loading several grains below the maximum? (I know this assumes that the higher the pressure the better consistency which seems to be valid in most cases I've seen.)
2.) Is there anything to gain from dealing with muzzle blast vs. loading low enough to avoid it?
3.) I am familiar with loading for the M-1, but are there any ways to get into trouble with the open gas systems of the AR10(DI) and M1A(self regulating)?
