For CAS pistol I have used 5 and 5.5 grains Trailboss with 180 grain RNFP lead of course... Also used Federal primer's..
Our pistols were action tuned by the Arizona Thumber so we had to use the softer Federal primers...
Would be a pleasant load for your Mountain gun..
Also used a heavy bullet load for our rifles but could not locate it for you. If I do I will add it to my post..
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