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Art Eatman · October 24, 1999, 06:45 PM

The purpose of gas checks is to allow a bit higher velocities than you would want without one--to avoid leading the barrel.

For instance, in a .30-'06, some 20 grains of 2400 behind the 169-grain lead gas-check bullet gives around 1,750 ft/sec. Negligible leading...Sharpe's book lists loads to 2,400.

I'd guess that unless the bullets you use are a very hard alloy, anything over some 1,400 to 1,500 ft/sec (?) would cause leading...

FWIW, Art

October 24, 1999, 06:45 PM	#3
Art Eatman Staff in Memoriam Join Date: November 13, 1998 Location: Terlingua, TX; Thomasville, GA Posts: 24,798	The purpose of gas checks is to allow a bit higher velocities than you would want without one--to avoid leading the barrel. For instance, in a .30-'06, some 20 grains of 2400 behind the 169-grain lead gas-check bullet gives around 1,750 ft/sec. Negligible leading...Sharpe's book lists loads to 2,400. I'd guess that unless the bullets you use are a very hard alloy, anything over some 1,400 to 1,500 ft/sec (?) would cause leading... FWIW, Art