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SMKs perform quite well. The hollow tip collapses on impact causing the bullet to yaw and tumble. I've pulled several out of the soft mud over the past two weeks and the jackets were all torn with deformed, exposed lead with a total diameter around 5/8" (these were .30 240's) and about 1 1/8" long.
Unless you are shooting a very heavy bullet, you're not likely to dump a lot of energy into the target by expanding the bullet and still get an exit wound at sub velocities when shooting large game animals. You can blend your own lead alloy bullets to a very soft compound, cut swags into the side, a large hollow point, lube them and throw 'em a a sub velocity. It may deform enough to do what you are looking for but you've lost the high BC and probably decreased accuracy. With fast twist rates you also begin to risk deforming the bullet in flight as the centripital forces try to tear/deform the lead. I haven't done any research on where that limit resides, but I'm sure it could be calculated with shearing tests on whatever compound you came up with. If you define performance as taking large game and finding your kill, the SMKs will do fine. If you have an issue with your existing twist rate and the bullets you want to shoot, you'll either have to change barrels or shoot shorter pills. The Hornady 220 RNSPs are very stable in a 1/10 barrel and will take a deer (I've taken 8 over the years). None have gone more than 100 yards (just like a well placed bow kill) and all rounds exited the body cavity
Hunting with sub loads should be looked at like long range bow hunting, not traditional gun hunting until such time that the bullet technology comes around to the subsonic market.
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