Has anyone had trouble with the coating ruining your barrels?? I was told today by my gunsmith that they are coated with teflon and after he shot 100 rounds with them, his accuracy went downhill bad, and he said he couldn't get his barrel clean. I just bought 350 of these in for my 6mmBR in 55gr, to shoot at coyotes and such, but I don't want to use them if they are going to ruin my hart barrel. Any ideas???
Zack
Zack