Here is the deal. Do you really need ANY firearm in this day and age?
Start bashing someone else's choice now and there may not be anyone left to defend your choice in a very short time.
I own two rifles that are chambered for magnum cartridges: a 257 Wby and a 300 h&h. Yet, my longest kill shot has been with a good old 30-06: two shots in the boiler room at a measured 370 yards on a mule deer buck. One shot would have sufficed but I shot him a second time, just to be sure, as he only flinched after the first shot. No magnum was used and none was required. A magnum would have allowed for less holdover for bullet drop.
My longest shot was with the 300 H&H, (Ruger #1) at a big mule deer buck, 489 paces. I held on the very top of the spine and then squeezed. One shot kill with the 150 grain Nosler Accubond. If I was hunting with the same cartridge a few years before, I probably would of had a 200 B&C typical whitetail buck, unfortunately I was under-gunned, holding a 30-06...........lesson learned!
How do you define a "magnum"? Case capacity over a certain volume? Over a certain velocity? Because it's in the name? My .375 Ruger is not a magnum, its not in the name. Would shooters scoff at the .30-06 if it had been named the .308 Winchester Magnum? Magnum is a marketing word, nothing more, nothing less.
The difference between a good mechanic and a bad mechanic is the size of the Hammer. A big hammer is great...but a good mechanic doesn't need as big of a hammer.
The 6.5 Creedmoor made Magnums obsolete.