The factors for recoil calculation are:
Bullet gr size
Velocity FPS
Weight of powder charge in grains
Weight of Rifle

Chucks tables aren't an equal comparison as the 7mm rem mag used has a weight of 8.5 vs the 3006 weigh in at 8.0 lbs. Therefore the Energy produced by the 7mm rem mag will be less due to the weight difference. If compared thesame weight gun the 7mm will produce a slightly higher Energy level across the spectrum. Without knowing the data (powder charge)he used it is impossible to say how much difference for but a guessusing an 8lb rifle instead would produce closer to 21 ft/lbs of free recoil energy.

This is whyall thetalk about weight as being something to consider. Fit, style/design, recoil pad, etccontribute to the felt recoil which is an unmeasurable standard by a formula but the portion that effects the shooter the most.

FYI, looked up some data on a 175 gr load and did a quick calculation based on what i have written down.
175gr Nosler partitio
2900 FPS (assumed)
62gr of Powder
8lb rifle

Produces 22.37 ft/lb recoil energy

online recoil calculator if introducedhttp://www.handloads.com/calc/recoil.asp