Man, you are gonna get a PILE of opinions here. RE lapping the bore: I really think that, unless you have a CLEAR copper fouling problem, that you will do much more harm than good. If you are going to lap, easy does it. A little flitz followed by some JB should be all that you need, AFTER you have identified some sort of problem.
If you rifle shoots well, then I beseech thee to leave it be.
When you say to yourself, "man, that's a lot of copper for just a few shots", clean it thoroughly, then take a tight fitting jag, start with flitz, 10 times back and forth. Follow with JB, same procedure. Last wipe the bore totally clean.
Shoot, see what you get.
The mere act of shooting the darn thing "laps" the barrel. Don't wear it out prematurely by unnecessary activity.
Last, discover Wipe Out foaming cleaner (not other brands). The stuff is miraculous.