given the price of 223 ammo and unavaiiabiilty of the bullets for reloading. Probably airsoft and .177 sales are way up, too. and silencers, actuall. All mean you need less practice ammo for 223. I see lots of frustration of guys trying to powder coat and paper patch gas checked 223 case bullets, without having enough brains to use 1 in 7 rifling twist and a 100 gr flat point bullet. Since you have to hold the velocity to 2000 fps, only a heavy bullet is going to cycle the action. Probably need a custom mold, too, since nobody has brains enough to figure this out.