There's some helpful info on this thread, but also a LOT of nonsense!!!

The 450 Marlin will NOT keep with the 45/70 in the same rifle simply due to the fact that the case holds slightly less powder!

Compare in Barnes #4.

A number of other manuals send conflicting messages.

Bob

www.bigbores.ca

"What shall it profit a man if he gain the whole world and lose his own soul" - Jesus