GREAT cartridge can't say enough good about it , very , very acurate , easy to load for , mine is in a ssk 12''contender with magnaport and I wouldn't want to shoot it with out the magna-port I'm not familiar with the carbines so I don't no how recoil would be in the longer bbl,JD suggests 270 hornadays for elk size game and up and 220 hornadays are a real deer stopper!!!!! I never heard that it was pushing the pressure limits in the contender , I don't think JD would have it out there if the pressures were a problem, also I see that the T/C custom shop is offering it now. I think it is the best big caliber for the contender.hope this helps , just my opinion Bruce