I used to use 11.0 grains of Unique with a 225gr. cast bullet in a Blackhawk, and never bent anything. Your proposed load should be plenty safe.
It was a bit raucous, but gave me 1465fps. in the 6.5" barrel, and 1.5" groups at 25 yards. I should have kept that thing.
Last edited by ratsmacker; 03/11/18.
