I love Norma brass for the two Winchester Short Mags that I load. I have loaded the 300 WSM
for over five years and I have used Winchester and Federal brass as well as Norma. I have loaded the 270 WSM for almost the same time and I have used Winchester, Remington, and Norma brass. The Norma brass is the best. It starts our more uniform (weight, length, etc.) and it has lasted longer than I can believe. I have shot some over 10+ times I have yet to have a split neck or a loose primer pocket. I will admit that I have stressed this brass with very hot loads. I shoot 165-175 bullets as 3000-3100 ft/sec.
I will not say that all Norma brass is this good since I have loaded my 280 Rem with it and I did not find it to be as tough as the Shortmag brass. Norma brass for the WSM caliber that I have loaded is heavier than the others and it has less volume. This was not the case with the 280 Rem brass that I tried.
I also love Lapua brass because it does all that you want brass to do. However, Lapua does not make brass for all the calibers that I load.