Well you hit it on the head - get a few spare barrels. Sarco, ORF, Ammunition Store, pretty much all over, and they are reasonable in price. As far as backing off, I wouldn't worry - the only thing you will do is burn up a barrel faster, but that's the fun of it. I'm guessing you shoot a semi-auto - you didn't mention a crank fire device. My advice is get one and really spend money on ammo!