With 155's I normally use N150. Last year I built a FTR rifle specially to shoot the 175L's fast, ended up using Varget and palma brass, N150 worked too(better elevation) but they weren't going as fast I needed them for what I was attempting. Still debating what I'll do for next year, been thinking of going to just 155 scenars with N150 for everything and just practicing a lot more, less headaches and that load shoots great in just about any rifle with no fussing.
I wish Lapua had made a 308 match bullet in the 185-200gr to compete with berger's high BC when they were designing those L bullets. For consistency/quality Lapua makes better bullets.