The classic history of the 7mm Mauser adds a little more in pride and perceived prestige which has nothing to do with efficiency or performance, it's just that little something more that most hunters gain a little extra satisfaction from.
I think you hit the nail squarely on the head. It's about satisfaction. A lot of calibers will do the same jobs strictly speaking. It's the same reason I load my own ammo and mount my own antlers and build my own arrows. The last few deer I've killed with my longbow were killed with arrows that are fletched with feathers from turkeys I've killed. One of these days I'm gonna carve-out my own self bow and arrows and go kill deer with that. Effecient use of time? No, but it sure is satisfying to me to do these things. Call me a caveman.
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