I would like to take into account guns that have been used, what was the situation and how effective was the gun used in that particular situation. Also, is there any documentation to prove the effectiveness? I usually carry either a Kel-Tec P-3AT in my back pocket and a Taurus PT-745 on my belt if I can comfortably. I think I may go back to the .38 spl +P IWB for the comfort and power ratio. I am trying to feel secure with my handgun and caliber choice.
The only real 'evidence' is S&M's discounted study. You might look at the FBI testing results, and go with either 45 ACP or 10MM.
Check
www.brassfetcher.com as well for gello results,
and, you'll get a good idea of what your rounds can do.
Shootings, by nature, are ALL different, with different results, and, they are NOT a predictible event, or result.
You will have to evaluate what the nature of the threats are that you might encounter, and, how much penetration you will need from your weapons of choice, and how much energy.
If you are carrying a Keltec, I'd look at carrying ball ammo, both for reliability, and penetration, in .380.
With the .45 ACP you also need to determine what you are
willing to go with, and, if 14" of penetration is enough, since that's what most gello results give you with the industry standard 45 ACP ammo.
I know
www.buffalobore.com makes a Plus P .38 load that gives you 1040 fps out of a snubby, with around 15" of penetration, and a 158 grain bullet. Kicks like a .357, a light .357.
Can't make you feel secure about a handgun choice, at least not with Taurus and Keltec. They both need to be kept in excellent condition, and tested regularly.
A S&@ revolver is usually very reliable, but, my 360 PD
'autolocked' after about 150 rounds, and a bunch of dry firing, so again, keep your guns in shape, and test them.
That said, carrying multiple weapons IS an excellent idea, considerably increasing the odds that when you have to pull the trigger, the firearms will function.