Trawling in the depths of my memory I seem to recall J.O'C writing one time that he had some dealings with Gibbs. Apparently Gibbs would not let J.O'C into the room where he was chronographing some of his loads. There was a window into the room where the chronying was being done and O'Connor claimed he could see the ejector marks on the case heads shining like a headlight, or words to that effect.
In other words, anything Gibbs claimed may have been true but likely at pressure levels that were far from sane. If venturing into this territory is your bag then be my guest. To my way of thinking you should just be moving up to a factory case of larger capacity where there is proven data available. Of course, some people like to just live on the edge!
Jim
