I've read about the Rigby brass not found strong enough when the .338 Lapua was being developed. Does anyone know where and how it was found weak? I`m guessing Darryl and others who load it up are in the 60-70k psi range. Are the Weatherby cases stronger and last longer. BTW, Darryl what do your hot loads in the 338/416 do that make them unusable after 3 loadings, primer pockets loose, cracks? Why on earth did they shorten the Lapua?