I only reload CF rifle ammo- mainly 30-06, .35 Whelan, and the pre-WW2 M70 in .375 H&H, so I cannot speak informatively on the topic of shotgun shells. BUT, having a solid background in both machining and tool & die welding (TIG) let me state this--over the past 45 years, I have been fortunate to have owned and shot a fair number of good quality 12 gauge American mfg. double guns- I have never: (1) opened the chokes, (2) reamed out the barrels to remove defects, (3)lengthed the forcing cones or have screw in choke tubes installed- and, I never will. RWTF
