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Preston, take any 12ga load in the 8 to 9000psi range and if used in the 10 you'll have even lower pressures. I say 8 to 9 because then it'll be down to 7 to 8000psi. The chambers are a bigger diameter so there's more surface area for the pressure to exert upon so there's less pressure overall. I've used RD,GD, Promo, 700X, Nitro 100 - they all work.