What is left? I could see a 500 necked down to a 44 maybe. There just not enough bore sizes/ case combinations. There are 11 in production, right? .204, 224, 243, 257, 270,284, 308, 357, 429,458,500. None of them really need to go to larger cases, The 30/06 based cases are already at the practical max for case capacity in the handi. I would like to have seen a 405 win and the 375 Win in there, as well as a 338 federal, as far as bores go, but there is not a real need or niche to fill. The biggest gap where something usable could be made is between the rimfires and the 357, but you cant shrink a chamber. Just pouring more powder in a case does nothing for me. Unfortunately, it does not look like we are going to have much to work with, at least in the near future.