Couple factory Muzzle od's that I know of.....
Sako/Tikka muzzle od = .630 muzzle od at 22.5"
Reminton Sporter= .660 muzzle od at 24"
Average #2 contour custom barrel is .575-.600 muzzle od at 24".
I would cut another inch off the barrel, rather than stepping down to a smaller contour size.
Last edited by slg888; 08/21/10.