I have a Webley & Scott 20 Ga made in 1960 with 2 3/4" chambers that is stamped on the barrel flats " 3 1/2 Tons "

I've been using Win AA Super Sport Sporting Clays shells with 7/8 oz 7 1/2 Shot in my Mdl 21 and Benelli.

Is the pressure too high with the AA shells to use safely in my Webley & Scott 20?

Thanks