My bias against the x54R has nothing to do with country of origin, other than the overall lasting effect that has on availability, as one consideration in the overall view. I’m not a Cold War era kid, so I don’t have any bias towards Russia, and thoroughly enjoyed my time working in Prague.
Here’s another parallel I would draw for the comparison of the .30-06 and x54R:When I was in my late teens and early 20’s (and gas could be bought for 57¢/gal), I pulled a stock trailer around the country with a Silverado with a 454. I also built a tubbed Nova with another 454. About the same horsepower, same modifications across the board, same carb, same cams, same transmission, same rear end... do you think the platform which carried each didn’t enter into the consideration?
Debating ONLY external ballistics among a couple dozen 30cal cartridges in the context of hunting is a rather boring pursuit, as the result is largely trivial. But for these 3, the external ballistics isn’t the meat of the experiment.