My first mil surp since 1964, this O3A3 (Remington 383XXXX, barrel maked R.A. with flaming bomb and 8-43) looks pretty good, under the cosmolineicon (? grease?) around the receiver still lots of green parkerizing on the bolt etc. Cracks behind the tang which I fixed. But the barrel is filhty, not sure if it's rust, solid cosmoline or pitting. Been working with bore brush and mineral spirits, Iosso, and Hoppes #9 Nitro without noticeable results. Any ideas??? What dia brush should I use, used a 30-06 and 308 but the bristles wear down to no friction pretty quick

Thanks
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