The design looks very similar to one of the varieties of slug that Griffin Airgun Ammo sells. Griffin calls them a "deep hollow base." It is basically a slug with a pellet skirt. I've tried Griffin's "deep hollow base" in .22 in a couple guns now and they shoot as good as NSA (in one case better than NSA) and always better than JSBs knockouts (at least in those particular barrels). Accuracy with the Griffin's didn't seem to deteriorate out to the 100 yards I tested them at. BUT, "accuracy" was typical slug accuracy, which is around 2.5-3" groups a 100 yards, occasionally better but average was 2.5-3." So, "hunting" accuracy, but not the pragmatic's choice for competition (Which can generally said of all small bore slugs, at least until you're up into rimfire power levels, so they say. Haven't personally confirmed on the high end of power levels, but all the results I've had with sub 50fpe slugs make me think the slug craze is the airgun industry equivalent of the tale of the Emporors New Clothes).
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