plug in the .22lr's velocity, bullet shape and material, and SEE how much "power" a .22 rifle has left at 1/4 mile.
With a heavy coat on,, you can cover your neck and head with your arms, turn your back on it and LAUGH. Ditto a 4" barreled .22 handgun at 300 yds. It will have all the power that a bb gun has at 10 ft of range
. The 1 mile plus thing on the .22 cartridge box is presnt because most people are VERY poor at guestimating ranges, especially beyond 1/4 mile, and "non-lethal" does NOT mean that it won't put out an eye, won't break glass, etc. The.22 rifle can still do those things, at perhaps 1/2 mile. The Army has determined that the piercing of a 1" thick pine board is the limit for "mininum lethality. They derived that from a .25 ACP pistol, since the .25 IS just "barely lethal" and WILL just barely penetrate one such board.

