thanks all

Another serious concern is the C.O.A.L. of the reloads. If they exceed I believe 2.550", you likely won't be able to cycle unfired shells out of the Marlin rifle. The governing factor being the size or length of the ejection port.
 
Marlin Microgrove rifling doesn't get along with lead cast bullets too well either. Even hard cast gas checked bullets wont solve the problem. For my .44 mag Marlin lever I have tried running bullets up to .431 and it still leads badly. I have been told if I go to .432 or .433 it may go away.

If the .45-70 bullets are .457 or .458 you will probably have leading problems with a Marlin barrel. For a Marlin in .45-70 I would want around .460 to prevent leading.
 
I believe the guide guns & 336 models have micro groovebarrels, if yours is a modern 1895 cowboy (336 action with octagon barrel) it will have the so-called Ballard style course groove rifling for lead bullets of all weights. Weather the gun will handle the pressure of what you have them loaded at is up to you to decide.

I have an 1895 that i keep the 500 or more grainers at 1200fps or less and the lighter bullets under 1400 fps.. The gun will probably handle more but I can't.
 
As long as the big slugs cycle the worst part will be standing behind it when you pull the trigger. ;)

Thats presuming that the chamber throat is compatible with the big bullets and the powder charges are at safe levels as mentioned.
 
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