Any time you change the crown, you run the risk of losing some accuracy. It's a job I'd entrust only to a first rate gunsmith. If your accuracy hasn't been degraded, I'd leave well enough alone!
Marine armorers that I spoke with at Camp Perry six years ago, did the job on a lathe, and only when absolutely necessary. Cleaning rod damage was the prime source of muzzle damage in their opinion.
Cherish our flag, honor it, defend what it stands for or get the hell out. Our Freedoms are not free, they've been paid for many times over by heros in uniform. Far better men than I, died that we could be FREE.
USAF FAC, 5th Spl Forces, An Loc, lll Corps, RVN, 69-70, Vietnam Vet '69-'73