I thought about something similar several years ago. It doesn't work real well as far as I'm concerned. What I found that works to simplify your bench is to find one bullet that your rifles like and stick with it.
I have a .30 Carbine, .300 BLK, .30-30, .300 Savage, .30-40 Krag, .30-06, and .300 H&H and none of them use the same exact bullet. I found what each rifle likes and shoot that bullet in that rifle. I just buy a few hundred of what each rifle likes and it keeps me shooting for a long time.
I do the same thing for ever caliber rifle I own, it's the best way I found to simplify my bench. I just haven't found a way for one caliber to do everything I want, I shoot a lot of prairie dogs and hunt big game up to the size of elk. .308 caliber bullets suitable for shooting large volumes of varmints are expensive and recoil takes a toll on you after a while even in the .300 BLK. I don't like the idea either of getting down to one caliber, there is no fun in it.