In other words, no real advantage in real world applications,
.....and then having to buy a flat billed ball cap, T shirts 2 sizes too small, and grow a man bun to go with the creedmoor...
A few years ago, the SAUM cartridges were all the rage, and wildcats formed from them. end all, be all!
Then the WSM and OMG the WSSM. And then the 6.5-284 became the darling of the press and long range shooters
Every churner had to have one of each as they came along.
Try to find ammo for any of these cartridge families in the store today, or even brass.
Are the Creedmoors just today's fashion queen? Due to be replaced by the next beauty to walk down the runway?
Or do they have staying power like Raquel Welch or Elizebeth Taylor?
We know the 243 will be well supported as long as our government allows us peons to own rifles and ammunition. Every corner store has some type of 243 ammo. And 308 case are ubiquitous. They will remain so for about the next 100 years.
Such considerations are not really important to most of us here. If a rifle becomes impossible to feed, we just have someone screw another barrel on. Hell, that first barrel is probably damned near shot out anyway.
But most of the world does not think that way. Most people are not even aware that a barrel may be changed. If they can not get ammo, the rifle becomes a tomato stake.
I consider such when choosing a rifle for a youth.
As to the 243 vs 244/6mm debate. Yes, Remington made some major errors with their introduction, which honestly are probably only mistakes with the wisdom of hindsight.
The 7.62x51 was brand new when Winchester adopted it as a commercial cartridge in 1952. Rem and Win each introduced their respective 244 and 243 just three years later in 1955. Remington failed to predict the popularity of the 6 mm as a big game round. Hell, who could blame them. The 270 was still considered controversial at the time for use on deer sized game. Just look at the writings of Elmer Keith.
Remington was looking to produce a new toy for the growing sport of rodent shooting. Looking to give the country bumpkins an alternative to our 30-06 for killing squirrels.
They succeeded admirably with the 244!
But the market shifted. Customers realized deer could be killed as well, or even better with a 6 mm as with a 45-70.
Add to that, varmint shooters were primarily handloaders in a time when handloading was considered an arcane art by most. And handloaders loved the availability of all that surplus 7.62x51 brass, just as they had been loving surplus 30-06 brass since the end of WW I.
From the very beginning, the deck was stacked against the 244 Rem. But it was not all Remington's fault. If any of us could predict the future, we would be billionaires in the stock market.