Inconsistent case volume, case weight spread higher than expected (versus 308 win lapua), Neck wall thickness variations far greater than expected (right in line with remington).
I do not hate Lapua, I have used it in 308, and will use it there again. I was shocked so bad on the swede that I said screw it and gave it to a friend who shoots only war swede's and his personal accuracy goals are about 2moa @ 100. He was very happy.
So no, I could have called Lapua CS, but in this case I did a friend a good turn. If I came off sounding like "Lapua sucks" I do apologize, sometimes the written word does not convey the spirit of what was meant.
But with a bit of work your win brass will do quite nicely. If you get the chance to directly compare win brass to lapua, you will see their weights are *VERY* similar, their rim diameters and groove cuts are also very similar. After judicious case prep, my winchester delivers very good accuracy! I have many, many reloads on my brass, but I anneal every 3-4 firing too.
P.S. I know I said that I have 100 cases, I really should have said that I had had 100 cases. I have 500 win cases, that I put quite a bit of time into prepping. I also have 500 Remington cases, they are good for screwing around, not quite up to win. Remington are lighter than win/laupa, their case head diameter is slightly smaller (and suprisingly more consistent from the point of fitting into the shell holder).