I'm going to dabble into .45-70 in the future with 300gr bullets and having been looking at a few manuals. Loads will be shot from a modern action so modern loads aren't a concern but, I am interested in lower pressure loads. One thing I've seen in a few places is that IMR 3031 offers lower pressure loads with midrange velocities. I'm not looking for a super kick in the pants so the Trapdoor loads look interesting too.
Surprisingly though, I have not seen any subsonic 500gr loads with modern bullets for any powder.
It seems like most of the modern firearms are 1-20 twist. Rossi's guns are 1-12. Anyone have any practical experience with loading either?
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