Texas Rick -
"the 284 had no reason for existing."
The other things you said per the 284 are accurate enuff but or except...
The 284 DID work thru the Win 88 & 100. The same reason you said the 250-3000 deserved to exist is that it would work thru the Savage 99. ** Same-Same**
Also Win attempted to achieve 280 (270) performance in a lever/auto actions. I don't know IF it did or NOT because I have never chronographed 284 Win factory ammo in anything.
But Win 'attempted'.
You also mentioned other cartridges that in 'your opinion' are good rounds and should not be obsolete..
In 'my opinion' some or all of those have NO reason to exist.
Opinions ---- Belly buttons.
Jerry
