Originally Posted by
cannonfodder
A 380 Auto and 9mm Lugar use the same diameter bullet, 0.365 but the cartridge is quite a bit different, 0.374 diameter and 0.680 long for the 380 auto and the 9mm luger uses a 0.391 diameter at 0.754 long. That extra cartridge size does two things, it keeps someone from dropping a 9mm into a 380 chamber and killing themselves, it also lets you pack in more powder and use a longer and heavier bullet. The 380 using a 100 grain bullet on the heavy end of the scale and the 9mm a 147 at the same extreme.
For a comparison, a 100 grain bullet in a 380 will run an average of say a high 800 FPS while the 9mm will push the same 100 grain pullet at a mean velocity of 1300FPS. That gives you a substantially higher ballistic coefficient which translates to stopping power.
Now for the down side, felt recoil is a factor of weight and energy. The more energy you produce, the heavier that bullet and the lighter the frame, the higher the felt recoil. So if you take a light 380 frame with a light 88 grain bullet chucking along at 970 FPS you will get relatively light recoil with much lower stopping power. But if you take that same 380 frame and stuff a 100 grain bullet in it chucking out at 1000 FPS your felt recoil will be substantially larger due to the heavier bullet but the trade off is more energy and stopping power. The same 100 grain bullet in a heavier framed 9mm firing at a somewhat anemic 1000fps would have substantially lighter recoil due the increased weight of the frame.
We do the same thing in sporting clays. You have two ways of reducing your felt recoil, aside bionic stocks. Add a recoil reducer, which is essentially a weight you put in butt stock or you shoot a 1 ounce instead of a 1 1/8 ounce load. To make a big difference you can add weight to the shotgun and shoot a lower weight shot charge for an exponential drop in recoil.
What does all this rambling boil down to; a 380 with a full house load will kick much harder than a similar load in a 9mm. Another thing you should factor in, in low light, the higher powder charge in a stubby conceal carry pistol will give you a big fireball, muzzle flash. That can make the second shot a spray and pray affair because you cannot see for several seconds after the flash.
You would be best off with a lighter caliber that you can control than a heavy caliber that you wince with when squeezing the trigger because of recoil anticipation. You just have to try a few and see what fits your hand and works best. Personally, I have a high recoil tolerance so pounding out 45acp’s all day does not bother me. For me, I would go with a 357sig or 40S&W or tuck the P220 away somewhere. I would never go lighter than a 380 although there are smaller calibers out there like the 32 auto. They just don’t have the knock down power unless you place the shot properly. In a panic situation, you are going to be more prone to point and shoot than taking a timed and well aimed shot. The larger calibers give you more fudge factor, but even a 22 long rifle round will drop an assailant if properly placed.