I guess if I had to rely on a load for bear in .45acp, I'd probably opt for my old "outdoors" standby of using a 200gr SWC (hard casted of course) loaded with 7.5gr of Unique. This would push it near 10mm levels of 1200fps +/- according to the literature. A recoil spring of at least 18.5lbs is recommended of course.
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