In regard reversing a hollow-base wadcutter, this was done for many years. Problem is twofold; first issue is, they tumbled badly (yeah, I tried them too…), and the second issue is, you’re probably better off with the square end of the round going the way it was designed.
Keep in mind that the British tried this same experiment a hundred years ago with their “Man stopper” series of rounds for the .455 and .476 service rounds. They first put out a double hollowed out (base and nose) round. They then switched to just a hollow base full-wadcutter, finding that round to be no less effective.
Last edited by ChiefWPD; 10-09-2012 at 20:28..