The 45/70 and the 450 marlin both exceed the case capacity of the 460. Any reloader can duplicate the 460 load and exceed it. Wild West guns in Anchorage would make what you want probably. You'll like their take down conversions and have a few other custom cartridges the make.
http://www.wildwestguns.com/
Use Caution loading Marlin Hot. One of the signs of too much pressure is a stuck case. The big advantage of the Marlin is quick follow up shots and having a stuck case during a bear attack can be bad news. It happened to my boss at work and he's a well traveled, experienced hunter with a den full of African trophies.
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