jake,
Maybe this will help you some;
7mm Rem. Mag., 175 gr. at 2,860 fps. in a 8.5 lb. rifle has 23.7 lbs. of free recoil.
7mm Ultra Mag., 175 gr. at 3,110 fps. in a 8.5 lb. rifle has 44.5 lbs. of free recoil.
As you can see it's goiung to be near close to double the recoil. My advice to you is see if you can find someone that owns a 7mm Rem. Mag. and shoot it a few times. While doing so remember that the 7mm RUM is going to kick you almost double what you are feeling. Then you need to decide if it's worth it to you. Lawdog