It will be interesting to see what the velocity potential of this pound is compared to the 45-70. All I have read, indicates it approaches "factory" 45-70 loads. The factory 300gr loads are around 1800fps. Handloaders, using modern rifles have exceeded 2300-2400fps withing the second level of loads listed in manuals. Don't mean to sound like I'm knocking it, I'm not, just comparing.
Level 1. BP and early 45-70 arms
level 2. marlin rifles, NEF
Level 3. ruger #1
Let us know