Gents,
I have several of the humpbacks, two 1950's A5's 12s (Belgian), an A5 12mag (Japanese) and a old Model 11 in 12ga (1920's, safety inside the trigger guard).
Shooting skeet, I use a A5 12ga w/ Mod bore (Belgian), but use the Model 11 from time to time as it has the CYL bore.
But I...