I have a milsurp Enfield in .308 that shoots for sh*t because the barrel gets copper fouled after a few rounds. Besides being poorly machined, the barrel is in good shape.
I would like to firelap it (or smooth it out someother way) the cheapest way possible. I am not trying to turn this gun into a match gun, just polish the barrel so it won't foul as bad.
I have already tried JB bore paste without avail
Go to a machine shop or industrial supply store. Look for Clover compounds or silicon carbide grease mix. Get a few different grits, roll them on to low velocity cartridges and shoot. Clean between grits. Roll grease onto bullets AFTER the cartridge is loaded.