I’ve often thought about doing this. One merit I can think of is there are many good bullets out there with great BCs that shoot extremely flat. The Berger VLD 168gr & 180gr come to mind.
Ive read some stuff on the 7 mag and found it interesting in terms of accuracy and bullet selection, and BC.
This may sound retarded but I got or re-got the idea after re-reading Tom Clancy’s “Ranbow-Six” a few weeks ago while on down time.
The American shooter, shoots a 7mag and Clancy goes briefly into the ballistics and reasons. Given his articulate eye for exact detail, I wanted to work some of those rounds up for fun and to see if they are solid. Without reviewing that chapter I seem to recall the bullet was a 168, which I thought odd at the time.
After re-reading some loading data in Sierra’s loading books I see that it is likely do-able.
Anyway winter’s coming and I need a project that goes bang with 2.5 pounds of pressure.
Since you already have long actions, the old 7 rem Mag is a good choice but that is a biased opinion since that is what shoot. The bullets you mentioned are good but do check out the Hornady 162 gr AMAX.