I forget if we talked this already, but I now also have a 500/450 No1 Express...a Tranter double patent rifle. I'm using 500/416 brass formed by a friend to have a few cases to shoot. In the process of chopping more 500/416 down to 2 3/4" (+ a tad extra) to go fireform. Never tried this before, but the rifle is very accurate with some quickly assembled rounds and I'd like more to see what it can do.