Mid-to-upper 20's in ft lbs of recoil. For comparison: the .270 is around 20 ft lbs, 30-06 is low-to-mid 20's, .300 mags (non-Ultras) around low 30's, and .338 mag upper 30's to 40 ft lbs. (This is assuming about 8 or 8.5 lbs (with scope) for gun weight.)
More weight equals less recoil, but wears you out quicker if you're gonna' carry it all day. Of course optimum cartridge selection and gun weight depends on what you plan on doing with your gun and how much recoil you can handle before it affects your shooting. Good ear protection goes a LONG way towards prevention of developing a flinch! Good luck!