Mine is in a Ruger #1H. I have tried several powders and a couple different bullets, and they all shot good, except Varget. H4895 works good as does Benchmark, maybe Benchmark just a tad better. Mine is giving me 2450 ft/sec with a 300 grainer, but it is a strong action -- might could go a little faster, but WHY? I have also used 210 grain Sierra JHP's and AA5744 powder -- never chronied them, but I am guessing around 1500 ft/sec. Good for takin the heads off rabbits and grouse, and letting my 120 pound women folk try Dad's Rhino rifle.
