Mule deer has probably forgotten it entirely, but he wrote a really good article about "semi-wildcats" several years ago. A Semi-wildcat is a factory round that is so hard to find that you have to handload it to get decent (or any) ammo. I'll bet there aren't a hundred .264 shooters who don't handload for it, so it would qualify as a semi-wildcat.
If you have to handload it to use it, it just might be "obsolete." If you have to buy used brass to handload it, it just might be even more obsolete.
If you have to make your brass out of 7 mag . . . then we know for sure it's obsolete.
