I have done a lot of work shooting cast in pistols as well as rifles both sub and supersonic.
I found over size bullets work best, generally 2 to 3 thousandth over bore diameter, and that had more effect on performance and reducing leading than alloy and hardness of the lead.
I never bothered with Dacron or other fillers even when using fast pistol and shotgun powders in rifle calibres that only filled the case to 20 to 30 percent of its capacity.
I have made up a gas check punch to make gas checks from copper sheet, and found that the aluminium deodorant cans are the right gauge for gas checks and perform well and not cost to me other than time.
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