I have a Marlin 1895CB with 26" barrel. Does anyone have a load for a 430 grain cast Gas Checked bullet?? Or a load for a Speer 400 grain SJFP bullet. Thanks for your time!!!
Senator.

The old Elmer Keith load for a 400 grain bullet is 53 gr of IMR 3031.
the Speer Manual has this data - buy one. They will last your life time.

Hodgdon has data on their web site.

I use IMR 4198 with a 460gr cast bullet in my No.3

I use 53/3031 with a 400 grainer jacketed; it will kick the snot out of you in a Marlin. For cast, I use a case full of Goex ctg, over 6 grains 5744, which burns out all the fouling.

There's about a gazillion 45-70 loads for jacketed and cast 45-70 loads on AR...a quick way to find then is do a "FIND" search on the Big Bore and Cast Bullet sections and all the powder makers have loads on their sites.

Or subscribe to loaddatadotcom and you can see thousands at once.

Thank you to all that have replied so far.
Senator