In some countries where powder burners have already been banned, the citizenry found other ways to shoot, even big game, with airguns. As a result, we here in the US are free to buy and sell these bigbore airguns at will, no legislation in most states and you can UPS them from door to door. The average Korean production air rifles comes in .25, .357, .44 and .50 cal. They equal a modern 380acp in ftlbs more or less. They arn't firebreathers but can take up to a deer sized critter. They shoot best with roundballs or soft cast slugs and they can be refilled either with scuba tanks at 3000psi+ or their are handpumps that allow refilling. With some bullet molds and a handpump, you are off all radar and can legally, quietly and inexpensively shoot as much as you like. They make fine hunters too. This is the direction I went in, along with muzzleloader to insure I'll always have something to shoot throughout all coming firearm bans. No need to pull a centerfire out of the safe, air can partially fill its place for me. J
R
.50 cal DragonSlayer(korean) in pic, gets 5 full power shots on a charge, shoots a .495. 180gr roundball at 700fps, can be dialed down for lots more shots at slower velocities. There are now quite a few american companies making these rifles too.