Will using fiber wads and cardboard overshot cards raise or reduce pressure as opposed to using plastic wads?

Will a load published for a 2 3/4" hull have the same pressure if it is used in a 2 1/2" hull?

It is fairly easy to adjust the overall height of a load using fiber wads and cardboard overshot cards of which I have plenty

On edit: I am not asking for specific load data and intend to use published load data from reputable sources. The problem is there virtually no load data out there for 16 2 1/2" shells. While I am experienced reloader of rifle & pistol ammo, I do not have much experience with reloading shotgun shells, which seem to be much more sensitive in regards to pressure variations with different components.

Last edited by Chantry; 10/04/20 06:50 PM.

I have become addicted to English hammered shotguns to the detriment of my wallet.