I'm not sure if you think like me, but when I think about firearms and different guns in different calibers, my mind wonders to
"which bullets are the deadliest?" and
"which gun holds the most rounds?"
I've done some of the hard work for you. Here are some pistols in select calibers that hold the most rounds [while not resorting to giant drum or stick magazines] and the bullets in that caliber with the highest muzzle energy [stopping power]!
I'm going to catalog pistols in
.22 WMR,
5.7x28mm, .
357 SIG,
.45 ACP,
10mm Auto and
9mm [I skipped
.380 Auto since it's just a pussified
9mm and
.40 S&W since it's a pussified
10mm Auto].
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We'll start with the Kel-Tec PMR-30 chambered in .22 WMR. It has a 30-round magazine and holds 1 in the pipe, for a maximum capacity of 31 rounds. It sports a 4.3" barrel. The MSRP is $455 USD, but good luck finding one in stock for that price. Yeah, this fucker is popular, to say the least.
We're gonna pair that with some
40-grain RWS Magnum SP .22 WMR ammunition, which has a muzzle energy of around
134 ft-lbs [foot-pounds] when fired from a pistol. This rimfire cartridge has a soft lead point and is suitable for precision shots up to
100 yards, but you can cut that in half when firing it from a pistol. This cartridge is best suited in a rifle [longer barrel = longer powder burn time = faster bullet = hits harder], but just like with a wasp sting, while
1 won't stop you,
31 will put your ass down for the count.

So
31 rounds x
134 ft-lbs / round =
4,154 ft-lbs of stopping power in your hands! The
.22 WMR isn't known as a man stopper, but precision and quantity are your friend when it comes to this round. So a Kel-Tec full of RWS ammo is my pick for this caliber.
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Speaking of guns that hold lots of little projectiles, I give you the FN Five-Seven chambered in 5.7x28mm. The U.N. petitioned for a new firearm [#MilitaryIndustrialComplex] that could shoot through bullet-proof vests, so this was FN's answer. Originally holding 20 rounds and 1 in the pipe, a ProMag extended magazine extends that capacity to 30+1. It has a 4.8" barrel. The MSRP is Snoop Dogg on April 20th high at $1,399 USD.
Ammunition for this gun can be hard to find, unless you shop online. I hate it when companies create proprietary calibers, but motherf
uckers are gonna do what they do. And with it being so rare, there aren't many statistics out there to go by, Obviously, military ammo isn't going to be available to civilians, but we
can get the FNH
40-grain Hornady V-Max cartridges, which are also called
FN SS197SR. These f
uckers have a hollow point that they fill with polymer to make it fly all the straighter, while still expanding and mushrooming on impact. This ammunition reportedly has a maximum muzzle energy of around
367 ft-lbs. Combine that with the
31-round capacity, and you've got
11,377 ft-lbs of stopping power in your hands.