Have you looked into PCP ( pre-charged pneumatic) air rifle..before you scoff at idea, the gun is not considered a fire arm and some pack one hell of a punch( like The Benjamin Bulldog.357 Will drop a 300lb feral hog, where it stands, at 100yds 1 shot.. the airguns became so powerful, many states allow them for large game hunting. ..Airforce air guns can get 25, 30, 308, 357, 457, and 50 cal models.