Thanks Daryl

So,barrel reaming is out of the question for a bpe really.

So,in other words,the pits are coated,yet not filled to any noticable extent,correct? Apart from use of some forms of ammo,there is no way to fill the pits with a hardened substance?(as one would have a tooth filled)

If the gun shoots well,the only thing to worry about is ceasing the pitting/rust i.e. by coating it,and using it as is,or do the pits cause other problems permanently regardless of such works?

The Mauser you did, is this substance you used permanently fixed(i.e. like the tooth-filling example) or does it come loose,or even secrete rust underneath??

Thankyou kindly.

Ben