pretty complicated on the crowning. lets see if i can attempt to explain my highly evolved procedure; ...
-chucked up my counter sink.
-took hold of the barrel with my hands.
-touched the spinning countersink to the barrel end being very careful to keep it level and centered.
- took my small light buffing wheel and carefully buffed the slight chatter marks outta the crown.
-use a magnifying glass to ensure that all the rifling are correct and even.
-use cold blue to touch up the bare metal.
i have used this method for several rifles and revolvers and have yet to encounter any rough accuracy from doing it this way. ive been told that i couldnt do this in this manner as i would undoubtedly "ruin" the accuracy but ... nobody told my hands they couldnt so they did the deed and took me along for the ride.
not being a smart ass but i have had some long range folks rub me for my "hick" ways but ... necessity really is the mother of invention and i have developed this procedure by trial n error till i got it rite. first crown job was on my muzzle loading 54 cal Hawkins style GPR kit as it came to me buggered up and i was out nothin to try to fix it ... so being hard headed i dove in to see what i could do.