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Crimp · November 18, 2007, 11:03 AM

Hodgdon's data shows 16.7gr of H-110 as max for the 158gr XTP. Their data says 1591 fps at 40,700 CUP.

SAAMI shows the max .357 pressure at 35,000 PSI, but I believe the old CUP max was 45,000 CUP, so you're getting up there.

I believe if I was loading heavy, I'd switch to a powder a little more forgiving, for instance Lil'Gun. Hodgdon shows 1577 fps at 25,800 CUP as their max for the same bullet.

November 18, 2007, 11:03 AM	#4
Crimp Senior Member Join Date: November 1, 2006 Location: West Virginia Posts: 276	Hodgdon's data shows 16.7gr of H-110 as max for the 158gr XTP. Their data says 1591 fps at 40,700 CUP. SAAMI shows the max .357 pressure at 35,000 PSI, but I believe the old CUP max was 45,000 CUP, so you're getting up there. I believe if I was loading heavy, I'd switch to a powder a little more forgiving, for instance Lil'Gun. Hodgdon shows 1577 fps at 25,800 CUP as their max for the same bullet.