Question: 22 magnum ammo what is?
Answer: Developed by in 1959 by Winchester, for their Model 61 pump rifle, the . 22 Winchester Magnum, also called . 22 WMR or Winchester Magnum Rimfire was a rimfire round that was designed for small game. Especially varmints like fox, raccoon, and even coyotes out to 100 yards, without doing a lot of damage to the hides.