Need some advice for reloading for a Marlin 45-70

[teddy12b]

I have recently tried to develop a load in my marlin 45-70 using 460gr hard cast with gas checks.  Ouch ouch ouch, I learned my lesson. 

I still have a bunch of these bullets laying around and need to shoot them at something, but I want to use less power obviously. 

Knowing that the 45-70 has three different power levels; trapdoor, modern lever gun, and ruger #1 would I be safe to load these bullets with less powder than the minimum recommended by the manufacturer?  I've fired these rounds at the lowest recommended setting for a marlin 1895 and they were still too much. 

Would I be safe if I loaded the rest of them up at 5.0 grains under the lowest recommended level?  I've heard that too little powder actually causes significantly more pressure, but seeing as this is a 45-70 would I just be stepping into the lower power level or would I be doing something entirely unsafe?

I could use some advice from people with more experience than I have.

[quickdtoo]

Here's some 460 CP loads that may be lighter than what you were loading, load 10% less according to their recommendations.

http://www.realguns.com/loads/4570cast.htm

AA has trapdoor data for a 475gr cast gas checked bullet that should work with the 460grCP bullet.

http://www.accuratepowder.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/458Cal(11.63mm)/45%2070%20Gov%2018000psi%20Trapdoor.pdf

As well as levergun data for the 460gr CP..

http://www.accuratepowder.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/458Cal(11.63mm)/45%2070%20Gov%2028000Psi%20STD%20Pressure.pdf

Tim

[teddy12b]

Wow,
  More information than I could have hoped for.  Thank you very much!!!

  I did all of my reloading with H4198.  I may have to get some different powder to use any of those loads.

[quickdtoo]