I own a couple rifles with the Douglas barrel. Ones an"xx", the other an "x". For target shooting, even out to 75-100 yds, both seem to like 45grs. of FFFg shooting a .445 ball and .15 patch. And they don't seem to be particular about the lube. But I like Bore Butter. Can shoot many times without build up of fouling, cleans up easier too. P.S. Love that Picture. "You got a pretty mouth boy"