Re: Cleaning chemicals
+100 on that 100 shooters line.
I like keeping it simple and just use Outer's Foaming Bore Cleaner. I had my doubts about something that worked so easy, but getting hold of a borescope on loan made a believer out of me.
Coupla soaks followed by patches precisely according to the instructions until a soak and patch cycle comes out clean. If you're feeling especially anal, do it again the following day.
Borescope says that when the patches come out clean, the bore <span style="font-style: italic">is</span> clean.
There's a sorta ground swell these days that suggests that cleaning bores frequently is anal, excessive, and perhaps even harmful. Hey, for all I know, they could be absolutely right.
But what I do know is this; the Outer's Foam is so quick and easy, it makes no sense to me to skip the cleaning in the first place.
Whatever you do, if the bore's dirty and might get left to sit for more than a day or two without cleaning...; take a moment to leave a coat of oil in the bore to forestall pitting.
Just safer that way...
Greg
PS ...Oh, and about that break-in... If it's an aftermarket premium barrel, break-in is a waste of time; and unless all you're doing is shooting your usual bullets and cleaning, could even be harmful and void warranties. I no longer favor abrasives.
If it's a Plain-Jane factory barrel, break-in might have some value; but after about one or two hundred rounds down the tube, with or without break-in, I doubt anyone could tell whether you did or you didn't. Under those circumstances, I say, why bother?
I used to be a break-in proponent, and had even developed a low effort, low impact method. But these days, I just don't feel much more than lukewarm about the subject.