I've actually developed some "maxed out" 7.62 x 39 cartridges for my AR47 that are almost the same ballistically as what Wilson claims for their optimum factory loads. But I am interested to see if there is an accuracy advantage to the Ham'r. It is pretty soft shooting--so far, but as I mentioned I think my loads were too under-powered. Upon further research I found a statement from the man himself, Bill Wilson, to expect anomalies with brass made from used 5.56, he says typically they need to be fire-formed to headspace correctly. I figure it probably gets a better fit to the chamber as well. Apparently they also say the barrels need quite a few rounds through them before they "settle down" and get accurate. I've heard that from many manufacturers; but in my experience truly outstanding barrels usually shoot great right from the starting gate.
Anyway, I ordered 250 factory cases but it's unknown when they'll actually ship even though the website says they are in stock (not Wilson's).