I'm not a purist in most things where practicality trumps it -- my Blaser K1 is chambered in the rimless 30/06 though I comsidered the 7x64R -- but with a double rifle it seems almost a tiny blasphemy to chamber it for a belted cartridge, but..

That 293-gr load is a pretty warm one is it not? Yea, the 9.3x74R is truly a leggy one.