I guess i dont see what a guy gains.
We gain knowledge to a "what-if" question. I'm doing the same load development because I want to know what extra benefits might come to loading pointy bullets in a .30-30. Do I need to know these things? No, I've got plenty of .30 caliber rifles that work fine out to as far as I want to shoot.
Am I trying to stretch the .30-30 into a .308 Win? No, I've got a .308 that works just fine, thank you.
At the end of the exercise, I might conclude that nothing is gained, but I'll have solid measurable knowledge about all the quirks. In the meantime, I get to do some experimenting, burn some powder, scratch my head and wonder "what-if".
If A.O. Niedner hadn't wondered "What if", we wouldn't have the .25-06. If Warren Page hadn't wondered "what-if" we wouldn't have the .243 Win. In the meantime, we're not hurting anyone, not violating any laws, and basically just having a good time.