I know the warning label on a box of .22 lr ammo says dangerous for over a mile. But what is the actual affective kill shot range of a .22 lr. I am thanking of setting up a 10/22 as a sniper system. Just incase I run out of ammo in my bigger guns. Plus I can stock up on more .22 ammo. Any advice on what would be the best threaded barrel to go with for maximum accuracy and range would be grate also.