For nuisance beaver in summer, we usually just break the dam a bit, put a 330 a little downstream and underwater. they always come to fix the dam at dusk and we have 'em by morning. A .22 Hornet through the top of their head can do wonders for your beaver headaches too. They're too tough to kill reliably with a .22LR or something quieter. Beavers are declared nusance animals in much of Saskatchewan. We killed 52 in one 1/2 mile stretch of stream on our land three summers ago. Didn't exterminate them either! We have eight new dams this spring, lost about twenty acres of hayfield. Our national symbol can be a pain in the behind! Good luck controlling yours.
Inside 30 yards a .22CB short broadside between the eye and the ear does the trick. With the 'puter knocked out they drown fast.
Taken many that way. Quietly.
