I have been told that All revolvers need firelapping, especially new Rugers, to remove the constriction caused by threading the barrel to the frame, and it makes them more accurate.
So, My revolver cylinder throats are all very close to .358 A .358 ZZ minus pin gauge will just fit with some oil and gentle persuasion. About equal resistance is met in each chamber throat. However, a .356 ZZ minus gauge will not enter the muzzle. O.K., the cylinder throat is supposed to be the critical measurement, right?
Slugging the bore won't work, because it has 5 lands, and I don't have or don't know anyone with the proper(and expen$ive) tool to do that.
I have some Hornady swaged 158 gr. semi-wadcutters, which are said to be very soft, and measure ~.358. So, If I do decide to firelap, could I seat them backwards over a light load of Trailboss, using JB Bore compound, and do a reasonable job, at the same time, not changing the diameter of my cylinder throats?