Drew Hause, very interesting your reply. It's the first time I read that 28 ga have more pressure than other gauges and that's the reason barrels thickness are wider than 20, 16, 12... I don't think so, but this is new for me and I'm in doubt.

You have information of the earliest 28g pressure testing. I suposse with black powder, so current pressure must be higher.

This is an interesting thread! Thanks!

Regards!

28 ga, hammerguns and all shotguns and rifles made by hands.
Waidmannsheil 🌿📯