Nothing showing on ammoseek. A couple years ago, maybe 3, Scheels in Rapid had piles of the stuff, but nothing else. I thought then I should buy a bunch for an investment lol but didn't. They do show some ammo at 2.50 a round.
I'd say it's dead or close to it. I seem to specialize in those types of rounds, I have a 300 Saum and 2 30 Rem ARs, and had 2 different wssms. Kind of fun to have something you know very few have on the one hand, kind of bad if you don't have a stash of brass though. Every once in a while I search gb for 308 Marlins or 307 Wins, they go for pretty good money.