First big game rifle I bought was Rem 700 7 mag when I was 16.I went to buy a .270 but it had a problem and the 7 was in the rack and I was leaving with a rifle.
Old Louie sold H-4831 bulk for $1.60 a lb,bring your own bleach bottle.Now,that was OLD style 4831.
16 year olds are smarter than most everybody else so I loaded 70 gr behind a 160 gr Sierra boat tail as my standard load (DO NOT TRY THIS,4831 IS DIFFERENT POWDER NOW!!)
PO Ackley said that was about 65,000 psi.I did not have a chronograph,but I did have busted glasses and a cut eyebrow.Sucker sure would shoot,though.
Which brings me to a point.SAAMI pressures are low on a 7 MAG as a lot of smiths were custom building them on Mausers and Springfields and there wasn't a lot of control over what rifle they were in.It is a 1963 cartridge.
That is an amusing comparison with the STW.It gets a bit more performance,but at much greater pressure.I am not suggesting you ignore SAAMI,but it explains the low performance in the tables.
In bbls less than 26 inches,I would not prefer the 7 mag over the '06.
In my experience,given both animals will be dead,you will have more meat to eat with the 06
For a mountain packing general hunt rifle,I might prefer a 22 in bbl.
But,for a long range plains rifle,the 7 can be good .I wont tell you my load,but I chrono 3050 with a 162 gr Horn SST .I do not use it for big game hunting.It is a varmint gun.(MDL70 Laredo,4.5-14 Leu long range 30 mmMil dot,Nightforce 20' bases.I have a custom made elevation knob for my altitude /load that goes to 1400 yds)
Another use for this rifle might be the finisher,for when others are optimistic about their long range ability.
The 7 mag is good.Read old Warren Page articles,he loved it.Use a bonded bullet,and IMO,160 gr or so.
You got it,enjoy it!!!