Another thought. If as you suspect it is some compound from that ammo, like lacquer, put some lacquer thinner in a container and put the rifle muzzle down in it overnight then run some patches through it to see if its gone or loose.
El Lobo
Another thought. If as you suspect it is some compound from that ammo, like lacquer, put some lacquer thinner in a container and put the rifle muzzle down in it overnight then run some patches through it to see if its gone or loose.
El Lobo
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