That's a good idea. You can probably find something nice and light that'll work. Some folks use, I think, blue dot (a pistol/shotshell powder) in rifle cartridges for some really light practice loads. I don't what would be a safe load for the 7mm rem mag, but I bet you could find one online. Try doing a search for Blue Dot in the handloading forum, and if you can't find something, start a thread asking for a low-recoil handload for the 7mm rem mag. Just make sure you find a few sources that say it's safe---not just one. Also, check a few other manuals, if you can. (See if you can't check out a few at your local gun shop) You might find that some powder combination and bullet weight gets you some relatively light recoil.
Off on a tangent feel free to skip if you don't like math stuff, and I'm not sure how well I'll explain it anyway... Recoil energy (which tracks pretty well to how much it hurts) a function of the square of the momentum of the bullet and powder charge that leaves the muzzle.
Note, the units are going to be all FUBAR, but for a quick approximation, take the (bullet weight in grains x muzzle velocity) + (charge weight in grains x 7000*) That will give you a value for "momentum", but not in the right units, to get to the right units, take the result (using 154 grain at 2800fps with 57 grains of powder), 830200, and divide by 7000 (number of grains per pound) to get 118.6. Now you have units of pounds*ft/sec, but (in imperial units) momentum has units of mass*ft/sec, so you have to divide by 32 ft/sec^2... Okay, 830200/(7000*32)... gives 3.71 slugs*ft/sec --recoil will be proportional to 13.8 (that is, 3.71 squared)
A 130 grain bullet at 2800fps with, say, 53 grains of powder would have a momentum of 3.28 slugs*ft/sec and recoil would be proportional to 10.8--a 20% reduction in recoil.
End Tangent...
Or, you could try Remington's reduced recoil loadings.
* some folks use 4000, some folks use 1.75 times the muzzle velocity, or some other value for the speed the powder and gasses leave the muzzle.