You might want to go to Garry Reeder's web site and check out some of his GNR cartridges based on the .348 cartridge. Then you can look as well at SSK industries JDJ cartridges based on the .444 case. I'd probably look at the JDJ's first because most of them can be shot in a Contender which would be about right for your pressure range.
You might try a wildcat version of the 56R case. You could have a rimmed .257 Roberts or a 9.3X56R. Actually as I typed it a 9.3 caliber rifle would be a pretty awesome little thumper of all animals. The 9.3X57 was a pretty popular conversion as well on a lot of old Mil Surplus rifles.
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