Yep, apparently the best burro-culling cartridge ever!
I used to know an old Montana game department employye, and one of his jobs way back when was to shoot elk that were destroying rancher's haystacks. (They use different solutions today.) His favorite "elk stack" rifle was a .220 Swift, as I recall a pre-'64 Model 70 Winchester. If close enough he'd head-shoot them, but if the range was a little longer (sometimes necessary on warier elk) he'd put the bullet right behind the shoulder, through the top of the heart. It worked every darn time.
