I recently bought and loaded some Hodgdon High Gun for 12ga 2-3/4” Cheddite hulls. You’ll want to verify the load data on their website; according to the data, it yielded 4200 psi at a velocity of 1180 fps for a 1oz load of lead shot:
High Gun 12ga Load
Cheddite 2-3/4” Case
1oz Lead
18.8 grains High Gun
W209 Primer
CB 6100-12 wad
Yield 4200 psi 1180 fps
There are other low pressure loads using Fiocchi 616 primers and Cheddite primers. Unfortunately, I don’t have any data for 2-1/2” 12ga hulls (yet).
There is load data for 12ga AA hulls, but the pressures are higher, but you should be able to find a 1oz load at 1180 fps that is below 7000psi.
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