I've recently acquired several hundred Piledriver, Jr. 425-grain 45-70 bullets. I use H322 and IMR 3031 ONLY in my Marlin M1895 XLR and GS rifles. I use Starline and Winchester 45-70 brass and Large Rifle primers.

I've queried Beartooth but received no reply.
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In the ether is my Mountain Molds .476-inch 440-grain WFN PB bullet mold intended primarily for my Model 83s, secondarily for SRHs. I use H110 for heavy loads, only Starline brass in 480 Ruger, Starline and Hornady in 475 Linebaugh. I prime with Large Pistol Magnum primers.
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Hodgdon's web site has no loading data for these bullet weights.

Please identify parameters for heavy loads for the bullet weights, in the firearms in which they'll be fired. Also include for each powder a DO NOT EXCEED charge. If you can allow me some flexibility with top-end loads, I can create perfectly tailored loads.