Dave, I believe the 16.1 is the choke. Some of the Spanish guns are marked ***16.4 or ****18.5 which is like our imp.cyl/mod.
In millimeters a 16ga. chamber would be 18.92
A 16ga. chamber is .745, in mm is: 18.92
A 20ga. chamber is .698, in mm is: 17.73
A 28ga. chamber is .626, in mm is: 15.90


Last edited by JDW; 03/06/08 04:43 PM.

David