I have had fifteen barrels, salt bath nitrided, Some using non toxic salts (Melonited) and arsenic salts, both new barrels and used. I have worn out seven 17 Reminton, 6.5 WSM, 6.5-284 Win .22-250 AI, .204 Ruger, .20 PPC. Since I use HBN coated bullets, I can take advantage of the speed from...