.45-70 Loads and Twist Rate

[dreadi]

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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[huntingfool7]

I've done subsonics with Trail Boss and SR4759 using 405gr lead and 350gr Maker Rex.  Trail Boss is the easy button for subs. 

If you look through the Maker bullet catalog there are some loads hidden behind some of the tabs. 
https://makerbullets.com/proddetail.php?prod=4570350S

I have not killed anything with the subs.  1400-1600 fps with any 405gr bullet is easy on the shooter and a killer out front.  I would describe those as mild thumpers.  Shooting a Marlin with the slow twist.