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You are right to be confused. The loading manual publishers cannot decide what is a safe pressure for the various .45-70 rifles either. For example, these are the maximum pressures listed for the three .45-70 rifle catagories:
Data Source.Trapdoor.…Marlin…..Ruger (CUP)
Lyman…….……18,000…..28,000….40,000
Speer…….…….21,000…..28,000….35,000
Hornady……….25,000…..40,000….50,000
Hodgdon………28,000…..40,000….50,000
Factory……..…18,000 reported
You will find that Ruger-level loads in the relatively lightweight Encore will be very unpleasant to shoot. They are too high in pressure for cast bullet as well. Trapdoor level loads work well for cast bullets, and Lyman lists loads for bullets close to what you have.
330 cast - 43.0/IMR3031 - 1338 fps/10,000 CUP
330 cast - 47.5/IMR3031 - 1532 fps/15,300 CUP
475 cast - 47.0/IMR3031 - 1657 fps/32,400 CUP
That last load will have substantial recoil, feel free to reduce 15%....
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