...now I know why I favor the .270 WSM. The 7mm WSN is not a 7mm (.270) but a 7,2mm (2.84) diameter bullet. So not a 7mm in my sense (like my 7x57)...
I have to correct myself. The 7x57 is a 7,2mm bullet. The 7mm WSM has the same bullet diameter (7,2mm). The .270 WSM has "only" a 7.0mm bullet. Still like the .270mm more than the 7mm WSM because it performs (slightly) better. Or am I wrong here again?