I'm wondering if this entire caliber isn't dying off. It seem like only Taurus and Ruger are making guns for it. The only really good loading seems to be the Speer 100gr Gold Dot. But that seems to be unobtanium, as do most of the advertised loadings.
For some reason I developed a slight interest in this caliber. But it looks like it never really took off and is not going to. It's somewhat hilarious that a couple of companies are pushing what is essentially an autoloader rimless version of this caliber (.30 Super Carry.) It will probably have the same success (or lack thereof.)