I looked up our pellet gun, and ours shoot at a velocity of 450 feet per second. That's just a break barrel pellet gun, it doesn't use CO2 cartridges.Thank you for all the replies. One thing I forgot to mention, is that I have very poor vision, I’m legally blind. So long-distance is not really applicable. And I really don’t want to deal with all the blood of cutting the head off. But I do know that I could do point-blank range. But I want to make sure that the gun is strong enough. And I don’t know if BBs would do it. Maybe pellets would be better even at point-blank range compared to babies. And I would always have more than one shot ready, to me that’s just common sense when you have a gun.
I looked up pistol BB guns here. They range anywhere from 400 fps to near 500 fps.