I bought some Accurate 5744 to load for a friends OLD Winchester rifle awhile back, and looking at the 45/70 data in the Lyman cast bullet book, see it listed.
This powder is listed as the go to powder in a number of cartridges for optimum performance.
I'm shooting a RUGER #1 - 45/70 and my go to bullet is a Wide Flat Nose bullet of 465gr. Velocity 1650fps
I have been using H335 for some years, and this bullet/powder have accounted for a growing pile of deer and three elk.
However, always interested in improved accuracy and while I fully understand that only testing in my rifle with my bullets will tell the whole story, I am interested in any info pro/con that anyone may have.
Crusty Deary Ol'Coot