You can use gas checks on BP to stop erosion of the rear of the projectile,BP burnts slowly with lots of heat. I also use wads between the powder and the projectile, one milk carton cardboard and then a lube biscuit. Lube is very important to stop hard crusting of burnt BPIn the bore. The projectile will bump up on ignition into the rifling and form a seal,and grip, round ball does the same. 500 gr of lead doing 1300 fps is pretty devastating.
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