Dude I got it from said that he had fired at least a 1000 of 9mm Luger since he didn't know any better... I've been firing 9mm Luger in it since I got it and haven't had a problem! haha
But, I did take a micrometer to it and it SEEMS to actually be chambered for 9mm Luger. I just can't imagine someone having a barrel made for it, but for what I paid - I honestly just don't care enough to special order the Largo... Luger chambers and fires perfectly fine in my personal experience. ymmv
with current ammo prices, longmountain is still high at .19/rd with shipping, however century often has it for about $135 case with 12-16 dollar shipping.
ammo-one is ridiculous at $25 a box. jeezus, however in their defense....it is better than a sharp stick in your eye.