Aught Six

I take the whole thing apart and scrub it clean of grease. Then I clean and coat the bore with Hoppes #9, put a drop of oil on the moving parts, and wipe down the exterior with a silicone cloth.

I usually do "break in" my rifles, but only with the first ten or so shots. Then I fire away and maintain respectable groups. For the most part, my rifles outshoot me, so I'm the one who needs to be broken in.