First, before shooting it at all, patch it out thoroughly to remove the Great Green Gobs of Greasy Grimy Gopher Guts that the manufacturing and proofing process leave in there... you'll get some MAJOR crud out, possibly including little metal shavings and whatnot. Get it out of there.
Then, shoot a few rounds and clean it again reasonably well.
Then, shoot 10-20 rounds and clean it again.
Then, stop worrying about it and just shoot the sucker until it pukes (accuracy drops off) and clean it. This will vary greatly from tube to tube; could be dozens of rounds, could be hundreds. A couple of mine shoot noticeably better clean (or at least not "fouled")... a couple shoot noticeably better somewhat dirty!
More barrels are screwed up, by FAR, by improper cleaning than by lack of cleaning. Clean from the breech end, use a solid (not segmented or coated) stainless steel rod, and use a rod guide that fits into the chamber mouth to keep from messing up the throat.
That's my opinion. I'm no expert, I could be wrong, but it's what I do and hey... you asked!
Welcome, by the way!
