Mark,
I've got a bag of ITX BB's on my loading bench, mostly just looking at it and thinking about loads. It is soft but...........for the cost I don't believe there is enough gain. Heavier than steel but lots lighter than lead. If memory serves, for BB's ITX is 64 per oz., steel is 73 and lead is 50 . I wish I hadn't bought it. I'd be willing to shoot it in most anything I own, but was hoping for a little more mass per pellet. I've got a South Dakota swan permit and was looking for a good load for those big guys. I'm thinking going to the semi-auto and Hevishot, leave the Sterlingworth in the truck.