Another pleasant surprise! I expect Savage factory barrels to copper foul. Badly. This is based in personal experience with a number of them. They're accurate, but they seem to be rather rough.
Apparently, this 243 didn't get the memo. I got almost no copper on a Sweets 7.62 patch, and an overnight Hoppes treatment showed no green at all. Nice to not have to go mining for copper.
Its all coming together rather nicely.