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My Para Ord P10 [now days called a Hawg] has case support at .235".
This is terrible, and should not be used for even +P, but I can shoot 45 Super loads by using Starline +P brass:
12 gr Power Pistol, 1.275", 152 gr LSWC, 1250 fps with a 3.16" barrel.
Pressure is ~ 29,000 psi.