You do not want to load old big bore cartridges with any powder that does not fill the case 100% . I think that real black powder is best , but if you worry about the fowling and cleanup I would try that Blackhorn 209, you load it the same as black , that is by volume. Fill the case and put a nitro card on top of powder then bullet to achieve AOL. I have loaded a few hundred rounds with it and all have shot great. I do plan on also trying Trail Boss.When you have extra air in the case you can get a chamber ring or worse. Just use a mag primer as Blackhorn 209 is hard to ignite. By the way Blackhorn 209 is I believe the only black powder substitute that is non corrosive and you clean up the same as any smokeless powder. Trail Boss is not a black powder substitute.
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