In my opinion the 7mm rem mag is at best a 600 yard elk rifle. The 338 Winchester with these loads would be much better on elk within this range or further. If I had a trophy bull out there at 650 yards and my choice between the two rifles I would take either of these quality hunting bullet loads over anything in a 7mm rem mag.
I truly respect your opinion and years of experience. I ran the following loads on my LoadBase 2.0 program and here are two graph results for the following loads:
Track 1 (red)= 7mm Rem Mag, Berger VLD 168 gr.
Track 2 (green)= 338 Win Mag, Swift Scirocco 210 gr.
Both are max published loads.
You can see that the 7mm maintains a velocity advantage over the 338 out to 1000 yards and beyond. Which means it shoots flatter. Then, looking at the energy chart, at about 450 yards the 7mm actually "out runs" the 338 and gains an energy advantage over the 338. This is due to the higher velocity and BC of the two bullets.
So for long range shooting in excess of 450 yards, the 7mm would clearly be the better choice. That is why GunWerks chambers their high dollar precision long range rifle (LR-1000) in 7mm Mag and not 338 Win Mag. It is simply one of the best choices for delivering high energy at long ranges that the human shoulder can endure.
This is the reason why I invested in this ballistics program.