I had a partial case head separation using a 1.8oz buffer

[Klem]

I don’t think it is correct to say lapua brass was weaker as we don’t know the alloys nor the yield strengths for any of the brasses, but it can be said that the brass is thinner so could be more susceptible to a hot gas failure.

Only if the brass is weaker, and as you say, we don't know it is.

Once again I stress caution about doubting Lapua. We still don't know exactly what happened, let alone Lapua was responsible for it.