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For 148gr 38 cal wadcutters do the bevel base or flat base versions work better? I cast my own bullets from straight wheelweight so the hollow base version is pretty much out of the question... haven't found the mold. The bevel base should be slightly easier to get started in the case but that's the only real advantage that I can think of right offhand. Thinking possibly the flat base version might give somewhat smaller groups.

I think for .45 Ed M recommends FB. Maybe that holds true for 38 also?

The hollow base expands easier making them seal off against the barrel easier under light loads. If your using pure lead which is softer and heavier, either should work. Just watch for leading, it will tell you if you need to go up on the charge.