I'm damn sure no Gunsmith and realize the 10mm came before the 40 S&W, but still wish the 10mm would have been brought to market with a small primer pocket and tough thicker web area as in the 40 cal case.
I don't understand why people keep repeating that myth. Try sectioning both a 10mm and 40 S&W case of the same brand. The case webs are exactly the same.
Sure, a small primer can make the case head stronger in theory, but if you're loading at the level where that matters (i.e. loosening primer pockets), you're way WAY past the max case pressure.
