I have no concerns about a small primer in a 47 L, temps get cold in Finland wink Alan - GSSP has done alot of shooting w/o issue in the cold.

I don't see the CM as being substantially greater in capacity to be an issue with SRP, but I think the SRP by Lapua on CM brass is more a perception/marketing strategy. Controlled tests might prove me wrong and a benefit in accuracy. Time will tell.