I'm amazed they can kill something so big iwith such a titchy round.
One of the guys on Swamp People took a gator with a NAA derringer. These are tiny guns. Go to this link to see how small they are: http://northamericanarms.com/
The .22LR has got a lot more penetration and killing power than many give it credit for.
A .22LR fired out of a short to medium barreled handgun will penetrate, on average, 11" to 13" of ballistic gel, depending upon load and barrel length. The better hollowpoints, like a CCI Stinger or Velocitor will expand to .30 caliber or better, even at the lower velocities of a short barrel.
A .22LR rifle, depending upon the load, will penetrate between 16" and 24" of ballistic gel.
At 300 yards, a .22LR 40gr CCI Velocitor hollowpoint fired out of a rifle will completely penetrate 5" of solid, raw meat (beef) with two layers of denim on each side, leaving a wound channel big enough to stick a man's finger in. A hollowpoint bullet recovered after the test had expanded to about .30 caliber.
At 300 yards, a regular .22LR 40gr high velocity solid round nose fired out of a rifle will completely penetrate a semi-frozen turkey wrapped in several layers of denim and flannel.
At 440 yards, a regular .22LR 40gr high velocity solid round nose fired out of a rifle will penetrate 1/2" of pine board. It takes about 59 ft/lbs to penetrate a 1/2" pine board and that is the threshold established many decades ago by the US Army for when a projectile starts becoming potentially lethal.
It's been estimated that more deer have been harvested in North America with the .22LR than all other calibers combined. Natives in Central America have been known to use it for hunting jaguar. Many moose and the occasional bear have also been killed with the .22LR.
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