Back in the day, I shot a Perazzi SC3 with 31" barrels and a Winchester Model 21 with 32" barrels. Both extremely heavy guns capable of shooting the stout pigeon loads.
I have been lucky to have a good friend who is a connoisseur of fine English Best pigeon guns and I have gotten to shoot Purdey's, Boss, Woodward, Atkin and several pigeon hammer guns. He once owned a Purdey Pigeon hammer gun that was owned by King Alfonso of Spain.
I believe there was an article about it in the DGJ once.
I am presently thinking of a project for a English hammer gun I have recently came upon but not sure it is worth the effort since things like this is a thing of the past. So I may end up just trying to sell it.

Mike Proctor