I took a look at the Wikipedia link, and immediately caught the comparison to the Japanese and Italian 6.5mm cartridges.
A brief thought I had was “why wasn’t the Pedersen round revived after WW2 for something like the T48”. If the .276 Pedersen really was similar to the 6.5mm rounds I mentioned above, that might explain a lot—both the Japanese and Italians found their 6.5 cartridges lacking on the battlefield, and began transitioning over to a .30 cartridge.
Agree 100% ...... That , back door politics (bribes), what was already in the inventory in the way of ought six etc .... many factors are in play with such decisions and I make no pretense as to the polidiot process for selecting a goobermint combat cartridge.
I have an old Swedish Mauser that was custom built for me on a chunk of 5A walnut decades ago in 6.5x55 and it is STILL my favorite hunting rifle. I use 6.5 grendel in a few of my varmint rigs.
Just my own PDW’s & Hunting tools .... then I choose what is best for me and what I harvest and my CONUS threat of soft illicit criminals bent on hurting me or mine is an evolving hobby of sorts. Always new and improved to test and ignore.
But you knew all that .....:o)
Stay safe !
I was reading an article in Guns & Ammo a few months ago. It was a comparison of the Garand and the Arisaka.
As you said, the Japanese went from 6.5 to a .303 caliber. The reason given was that it was much better for odd rounds such as tracer and I can’t remember the other specialty rounds.
I suspect those problems are no longer a deciding factor.