7.65mm Luger specs

[Lugerdoc]

Steve, Just remember that the German engineers were not measuring in inches. The standard 4" military 9mm barrels were actually 100mms, Navy 150mm, Artillery 200mm and carbine 400mm. So probably none of these even measurements are optimum for either caliber, but up to a certain point, the longer the barrel, the higher the exit muzzle velosipy with a standard power charge. TH