1911 45 ACP load with 24# recoil spring. I loaded 250 rounds of HS-6 with a 255 grain SWC in 45 ACP cases. Brisk recoil, published Hodgdon load data (1980), and really moved bowling pins off the table. I don't believe I would shoot 10,000 rounds but it worked great for a season of pin shooting. I used the same powder and bullet weight in my 44 mag Ruger Redhawk, also brisk recoil.

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S&WHF 366