In a .38, I wouldn't go over 3 grains. You will get a LOT of lead in the bore. I never tried it in a .357. If you wanna go faster in those calibers, try another powder that isn't so fast burning. Use 2400, 4756, Unique and others. Bullseye has a specific niche in the loading world. It's for light to medium target loads, and is used in small quantities/load. A pound goes a LONG way. It doesn't take much to go from a target load to a grenade.
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