A .284 as in a .280 AckImp would be perfect for cutting the body and moving the shoulder just a bit further forward. The Winchester case is too short and large diameter .475 shoudler .500" base) seem to me.

A .376 Styer reamer would fresh up and Improve 9.5x57 using that chamber length of 2.235", but that would merely be a .376 Styer shortened 1/10" or so.

A 9.3x57IMP in a M98 would easily give slightly better than 2,340fps with a 286gr., but in a M96, virtually duplicate our slightly downloaded 9.3x62 ammo and do it in a slimmer, more easily handled rifle. Those 46 husky's are NICE slim, quick handling and pointing rifles. Cock on opening devices can be attached if required as side swing safeties, I'd expect, I think, as well as speed locks, etc. But then, I really like the rifle the say it comes. Mine was built in 1929.