I'd say this if you could actually find reloading components but since you can't, it doesn't really apply...
As for the ammo, if it's range ammo, who cares? As long as your gun goes bang and the bullet generally goes where you point the gun, it doesn't make much of a difference. When you get to talking about HPs, then the ballgame changes a bit. But for range fodder, anything that runs is fine.