In my Kimber Montana the best powder so far with 140 Barnes TTSXs has been RL 19. It shows two nodes of about equal accuracy - one at 49.0 gr and one at 52.0 gr. @ 3/4" - 1" @100 yds.
I have not chronographed but, based on data in manuals expect it's somewhere between 2850 and 2900 from the 22" barrel. Has proven effective on elk.
