I don’t see how twist in a handgun makes a meaningful difference in terminal performance. As has been stated, as long as the projectile stable in flight, I would think differences in twist would be essentially undetectable in terms of terminal performance.
1/16 vs 1/10. If your target is 15” thick the slow-twist bullet makes roughly 1 revolution in target and the fats twist one makes 1.5. That’s before slowing down due to resistance. It’s not like it’s in there spinning like a buzz saw or anything.
Even if it makes some theoretical difference I would imagine it is minuscule compared to all the other factors. Heck, most 1911’s are left twist while most non-1911 .45 ACP’s are right twist. Spinning the bullet the ‘wrong’ direction would seem to be a bigger design challenge than the twist rate differences discussed above, yet the same bullets perform well out of both twist directions.
