I have shot the 7-mag, 280 and 7-08 over the chronograph with hot handloads. I logged these velocities:
7 Rem mag with 24" barrel:
139 gr Hornady Inter-Bond, 71 gr RE22, 3150 fps
162 gr Hornady Spire Point, 66 gr RE22, 2980 fps
280 Rem with 24" barrel:
139 gr Hornady Inter-Bond, 57.5 gr IMR4350, 3120 fps
I didn't test the 160 gr bullet in this rifle but my manual shows 2850 fps.
7mm-08 with 22" barrel:
139 gr Hornady Inter-Bond, 45 gr IMR4895, 2950 fps
160 gr Nosler Partition, 43 gr IMR4064, 2780 fps
Look for efficiency in the numbers. Is that extra powder, recoil and noise of the 7-mag worth it? If you reload, get a chronograph so you can get the maximum velocities out of your handloads. Your groups will depend on your rifle.