The Firing Line Forums - View Single Post - Need some advise from hand loaders for a 308 please

Jimro · February 8, 2015, 09:14 AM

Bart B.

The ammo in question is Hornady Superformance, which has a different pressure curve than standard ammunition.

The adjustable gas block should fix the problem, which is that the sooner than expected peak pressure is causing earlier unlocking while the cartridge is still under significant pressure. It may turn out that the lot of Superformance being used is just unsuitable to that rifle, although I think the adjustable gas plug will work. But a potentially bad lot of ammo isn't out of the realm of possibilities either.

We used to see this when people would try to run "Hornady Light Magnum" loads through Garands and M1As without adjustable gas plugs and they'd ruin the op rods.

Jimro

February 8, 2015, 09:14 AM	#60
Jimro Senior Member Join Date: October 18, 2006 Posts: 7,097	Bart B. The ammo in question is Hornady Superformance, which has a different pressure curve than standard ammunition. The adjustable gas block should fix the problem, which is that the sooner than expected peak pressure is causing earlier unlocking while the cartridge is still under significant pressure. It may turn out that the lot of Superformance being used is just unsuitable to that rifle, although I think the adjustable gas plug will work. But a potentially bad lot of ammo isn't out of the realm of possibilities either. We used to see this when people would try to run "Hornady Light Magnum" loads through Garands and M1As without adjustable gas plugs and they'd ruin the op rods. Jimro __________________ Machine guns are awesome until you have to carry one.