I have been loading my 10mm rounds using new Starline brass. Yesterday I tumbled a couple hundred cases I had shot the day before, when I got them out of the media I noticed a couple of split cases. These were vertical splits mid case, most common to me when shooting hot .44RM loads. The brass had cycled twice, using Blue Dot at 11.0grs (max book), shot in my stock G20 barrel. I guess what I am asking is how many cycles are you getting out of your new Starline running max book (but not nuclear) loads?