alt Hacker News>pellet guns have low spin per inch, and use drag to add extra stability. and keep velocity below that trans-sonic shock range.
They are strong enough to embed the pellets into wooden fence boards already though. I think that is plenty enough velocity to blow out your trachea, enter your brain through your eye socket, and probably also penetrate the soft part of the skull.
definately not a kids toy.
i have couple of pellet rifles that will penetrate [2] gallon milk jugs full of water at 50 yards and leave pellets on the bottom of the third, 6" grouping with quick reload shooting.
dont get me started on souping up the piston, ive already talked about alternative projectiles, but yes it can be made even more powerfull so it will yeet signifigant grain wt.