It kicks pretty hard,depending on the stock design more than a 7mmSTW but not as bad as an Ultra Mag. A muzzle break would certainly make it more comfortable,(probably equivalent to a 30-06)however you will than have to deal with a longer barrel length which would probably be close to 26" maybe even longer.
I'd suggest a good recoil pad instead and a gunstock designed to manage the recoil of the larger magnums.