The Hornady manual has three separate sections for 45-70 Reloading data.
1. For "factory Loads" which are safe for the trap door Springfield military rifles.
2. A hotter category for the modern lever guns like you have.
3. An even hotter category for the Browning 78.s, Ruger #1s and those make on a Siamese Mauser Action ONLY

I would not use them in MY lever gun.