Thanks for the input eagle27. Indeed a 150gr would be sufficent, but a 196 sounds so cool.
It may re-new my cast bullet habit as well. I have/had a wonderful old Lyman mould with a HP plug in about 215gr sized and GC. In searching for info, I have notice many references to this chambering in MS. More so than referring to it being used in a MauserKurz.

After it arrives I will make to cast and measure. Have not checked, but wondering if I ca make a die off of a 57mm reamer........

I will have to look but I think I have some 308 or 358 without any head stamp on them......