I bought into the fast hollowpoint bullet theory, and that's all I loaded in my 357 for years (125 JHP), and I loaded it hot. So now I live in the country and occasionally trap pigs. Had a large open-topped trap full of midsize pigs last year, and needed to 'terminate' them. I went to the house, got the Python and a box of ammo and went back to the trap. The box of ammo was about half the 125 JHP's and half a 148 grain wadcutter, loaded not so hot. I started blasting pigs with the 125 gr JHP and just not getting what I expected in results. I switched to the 148 gr wadcutters and knocked those pigs flat. I could theorize on the why's and wherefores, but the simple fact is that the wadcutters were more effective in killing pigs than the hot, fast JHP's. For lack of a better idea, I'll say it's due to better penetration with the wadcutters. I haven't tried the same thing with my 9mm, which is loaded with 125 gr JHP's, so can only report on the 357 and bullet choices and results.