Re: Threading Barrel ?
I too have always made it a practice of cutting a crown whenever threading or working on a muzzle. It's set up anyway and I've done enough of them to know my way works.
Nothing would suck more than taking a completed rifle (coated, blued, painted, etc) to the range only to find out the crown sucks and gun won't shoot.
Now what? You have several more hours (dollars) invested into trying to fix a mistake with a rifle barrel that has finish on it. Now how do you hold onto it without fuggering anything up?
Its darn near impossible.
Even if you don't charge the guy for it, I'd still do it just to avoid a potential headache later.