EXPANSION OR PENETRATION? Read bellow I'm a serious air gun hunter and I'm diving in to firearms but the thing about air gun hunting is there is NO hydrostatics shock. Right now I'm using a 17.cal air gun producing nearly 20ftlbs at the muzzle but I use this for squirrels birds and rabbits. I can't shoot birds with it because it blows them to pieces so I can get any meat from them. I want to use this for raccoons and I know I can. the question is do I want penetration or expansion???? The ammo I'm looking to try for raccoon,woodchuck,possum,fox and any coyote who decides he wants to eat my barn cats or my goats or pig is 17.cal predator polymag with polymer ballistic holowpoint and gamo PBA bullet. The bullet is copper/alloy and doesnot expand but gets way more penetration then a standard hollow point.