I’ve been told by someone who knows that one hit from .45 would have knocked the Aurora shooter off his game. A 9mm would not.
Getting smacked with a baseball bat (about 90 ft/lb/sec) will knock you off your game. A .22LR will do as much or better. People shooting ANYTHING at you tends to loosen the bowels and make you think about doing less stupid stuff.
Your expert may not be.
/johnny
Your comment about .45 is ridiculous.
As a hunter, and someone who grew up in/around guns (primarily rifles), you see a lot of deer shot.
Here’s the breakdown
1) KNOCKDOWN It matters WHERE you get shot. Caliber/FPS makes no difference if you don’t hit large mass. Arm/leg through and through does not knock down. IF you hit a bone, FPS / Caliber does not matter, you get knockdown. The ONLY slight edge a big, slow bullet has is in knockdown.
2) GET UP - after knockdown, the deer can still get up, it’s running on adrenaline. It can’t get up though if heart or headshot, or broken support bone.
3) RUNOFF - the less blood, the longer the animal can continue to run/struggle.
4) SHOCK — This occurs NO matter if you get a major hit or not, the animal CHANGES it behavior. If it’s a human shooter, he ducks/covers INSTINCTIVELY even if he has no fear — he will come out after his instincts take over.
ANY GUN is better. They GUN you left at home that’s a .45 is worse than a .22 revolver. BTW, a LOT of people have been killed with a .22 it’s a nasty round, especially in hollow point.
Gunblast has a great video of a professional shooter (the bearded guy) who can put 10 .22 holes in the size of a end of a cup at 10 yards in 3 seconds. About twice as fast/accurate as when he shoots 9mm or .45
Read “Incident in Miami” by Masaad Ayoob.