[Paul Harm]

I may be wrong, but at those pressures I don't believe it makes any difference what 10ga hull you use, they're all a straight walled hull, even Federal and Remington. I use Fed, Win, and Rem 10ga hulls and load them all the same. Right now I'm using 21grs of Green Dot with 1 1/16oz of shot and the SP-10 wad and a fiber spacer in the wad under the shot for correct load height for a good crimp. I've also used the 19grs of Red Dot or Promo [ it's the same thing ]. If you look up Fed 12ga loads, they being a straight walled hull like our 10ga hulls, you'll find using a Win primer, any where from 16 to 17grs of 700X with a 1 1/8oz load gives pressure from 6800 to 7900psi. That same load in a 10ga will be less because of the larger chamber diameter. Without testing, about 1000psi less, so even if it were the same, you'd be perfectly safe. A 1 1/8oz load with 23grs of Unique has 8600psi in the 12ga. With Inter'l, what you have the most of, it's 23 to 24 grs at 8000psi. And those are all with a fold crimp. Your roll crimp will have around 500 to 1000psi less. IMHO, any of the loads I wouldn't bat an eyelash of shooting. Good luck - Paul