One really easy way to firelap might be to get some Aguila SSS 60grn "sniper" 22's and use them [sparingly] with a drop of some JB bore paste or similar on the top of the bullet, but like was mentioned above - with only a few rounds!
The 60grn Aguila's are advertised to have @950fps muzzle velocity, altho I've found they're much slower than that. They are solid lead however, with a long bearing-surface and look ready-made to help smooth a bore.
I'd also run a patch trough the bore after EVERY shot to catch any left-over and accumulating residue. Plus one would have the benefit of feeling/seeing the patches (theoretically) get easier to push through bore as it became polished, indicating how successful and quickly the "firelapping" was working.
Apparently the procedure is indeed a very delicate one!
