buellsfurn
Ultimate Member
search has no results Billman Choke yes ok to good or no junk run the other way
My Factory flush IC measures 0.713 inside diameter (ID) with dial calipers, so I reasonably trust their size chart.Constrictions/inner calibre in inch diameter:
C Cylinder .723
IC Improved Cylinder .715
M Modified .705
IM Improved Modified .695
F Full / .685
Constriction number are nominal. Usually chokes come .003-.005" smaller than listed and expands the first 25 shots towards the given constriction.