Take this for what you will. I use Lapua brass almost exclusively and I can tell you from first hand experience Lapua brass is without a doubt the toughest brass on the market when it comes to holding primers. So if you were losing primers in Lapua brass at 22grains, that should have been a HUGE sign, for whatever reason, your loads were WAY HOT!!!
With Lapua brass if you even start getting the primers going in easier than normal after only a couple firings you are running things way over pressure.
Also, powders vary from lot # to lot #. I remember a few years back H1000 was giving guys fits because it seemed to be running a lot hotter than it had been. You always want to reduce your load a little when you open a new can, especially, if it's from a different Lot # which is why it's better to buy powder in 5 or 8 lb'ers if it's something you shoot much of.
