Winchester Model 12 Full Choke Questions|Winchester Shotguns|Forum|Winchester Collector

 Were the bore diameters and choke diameters on the full choke Model 12 2 3/4 inch shotguns, the same as on the Model 12 Heavy Duck Guns?What were the diameters on these guns?

  Did the choke diameters for the full choke guns change any with different years of manufacture?Were trap guns made with a tighter choke than the standard or HD guns?