Roscoe, FWIW, I've built, loaded and shot several of these rifles for years, (Shilo's, Winchester's, Remington's, Ballards, even Pedersoli's) started with black, convinced myself early on that black was the only way, about ten or twelve years ago I experimented with duplex and smokeless both, I've settled on smokeless with results consistent and close to all the black I've burned. What I really like about smokeless is the cleanup, the guns are the same, but the brass... cleaning the brass after a black load is a pita. I load smokeless in .38 cal.,40's, 45's, 50's and getting ready in a .577. All I ever shoot is lead cast though, and I keep my velocities very similar to the loads in black powder. My preferred powder is 5744, one of the secrets I have discovered in loading this... Accurate claims this powder is not position sensitive, maybe not the smaller cases, but on the larger cases, I use a toilet paper filler, 1/4 to half sheet, and I use a card at the base of the bullet, this seems to improve consistency. There are load specifications published by Accurate, start at minimums and don't chase max loadings just because they are there. I discovered quite a while back, my guns and loads do extremely well, most of the issues are from the guy jerking the trigger, occasionally I find another place to place the blame, bullets, wind, sight, a particular gun, but mostly me.
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