Thank you Drew.
That clarifies a bit of stuff. Especially that I had picked up from somewhere an erroneous belief that those old 3"loads were somehow of a lower pressure than they really are.
4 tons, That is a lot. This Gun is also very stout with chamber walls measuring .200" .
I use this gun mainly for DTL trap with 2 3/4" 28 gr. 1250-1300 fps. 7 1/2 shot, Spartan or Saga trap loads.
Some times for hunting foxes I use Eley Alphamax +,12 g, 36 gr, AAA. 1298 fps. Is that too heavy or high pressure ?
I have two other modern 3"magnum guns so I don't need to shoot heavy loads in that pigeon gun, it's that I just like to.
O.M