The indoor range where I live has these rules 1. Lead bullets only are permitted; no jacketed bullets may be used. 2. The maximum velocity for centerfire handgun ammunition is 900 fps. No magnum loads may be used (change springs if your pistol does not function properly). Low or standard velocity .22 caliber rimfire rifles and pistols may be used. Sounds like this rules out my .40 Hi-point. I haven't seen any ammo in .40 that would meet these requirements. I'd be leery of shooting un-jacketed bullets with that low of pressure in a blow-back semi-auto.