Originally Posted By Madcap72:
That "12 inch" penetration picture really just pisses me off. All it shows is what happens when you cherry pick results and place them side by side. And people are dumb enough to fall for it when it gets posted.
Anyone can 'cherry pick' data...and to get someone's attention, you often need to have a good visual. I've seen the link O_P posted above and have read it in the past...lots of good data.
For me (first and foremost) when someone asks what to use for self defense...I try to figure out what kind of a 'shooter' will they be?
The guy that buys a shotgun for home defense, loads it and puts it in the back of the closet, just in case (and the same 3 rounds are in it when he finally gets rid of it...and never took the plug out that made it legal to hunt with)?
The guy who wants a night stand gun for home defense, maybe shoots a couple of rounds when he gets it and loads it up and never takes it out again?
The girl who's afraid of the ex that's stalking her, but is afraid of guns?
The guy who wants to use the gun to defend his business and treats it like any 'tool'....learns to use it right and takes it out occasionally to keep up the 'maintenance' on it?
The guy who wants to carry because he realizes the world is getting more dangerous and he's the only one who can reliably protect himself and his family...
And, finally the newbie ARF member who's here to learn how to prep for the Zombie Apocalypse.
Each of them has a different 'need' in a firearm.
Once you help them pick out the firearm that's 'right' for them...and considerations include how much practice, what their use will be, and how will they handle recoil...then you get into fine points like Ft Lbs of muzzle energy vs. the proper amount of penetration (without over penetrating).
A pistol that under-penetrates (or over-penetrates due to lack of expansion) may still be the appropriate pistol for a small-handed, recoil shy female if that's the only one she can handle and shoot accurately and reliably. I sold some ammo (some .25 Glaser and .32acp) to a guy locally and got to chatting...). He's a shooter, but due to medical problems with his hands, he can't shoot anything heavier. But he's still shooting to the best of his ability.
Using Muzzle Energy isn't the a good metric for picking a handgun round.......(my home defense and carry stuff is listed in the link O_P posted however...I can hit reasonably well with the gun that takes it, I can get it in boxes of 50 to practice with, and at the +P loading, it's potent enough).