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The chamber is generally cut after it is lapped, ie fitting & chambering an after market barrel ?

Where the reamer cuts the throat or lead etc apparently.

I have been told that with a "good" barrel, lapped, Ultra match etc, the chamber edge is where the majority of the copper fouling comes from.

The little burr left by cutting plasmaises the copper...

Yes it was a major PITA cost me heaps to bring it in.......Bloody cool rifle though much nicer than a TRG, IMHO.....owes me about the same now :XD:

It isn't the barrel that causes most of the...

I doubt any one has had any thing close to the factory barrel on my Barrett 98B in 338 Lapua magnum, it was still badly copper fouling after 700 rounds, by that stage I was only using it for muzzle...