subsonic 45/70

[mapper]

No experience using cotton/dacron as case filler, I do know that certain powders are sensitive to case position at various fill densities.
I don't load 45/70, but did run across some threads and subsonic loads ( think trapdoor ) using trailboss, since it is a bulky powder.

I'll see if I can find them. Most of the other load data I have seen is supersonic, and trailboss, or unique was not listed.
I also saw instructions on using trailboss with no known load data, based on bullet seating depth, and case volume.
http://www.imrpowder.com/PDF/Trail-Boss-data.pdf

I have only looked at it from a educational standpoint.
And most of what I saw was cast bullets, not jacketed.
https://thefiringline.com/forums/sho...d.php?t=422131

This one is about subsonic and 500 gr jacketed.
There are diffrent powders reccomended,
Lead pushes easier than jacketed, and I wouldn't want to stick a bullet in the bore.
https://thefiringline.com/forums/sho...d.php?t=480301