What caliber has caused more casualties than any other in wartime?

[10thmountain]

.303, .30, 8mm, 54r has done the most damage of all times.

 

[lostchild]

That's a rumor

wwI allies mostly used french 75mm artillery, though there were bigger guns...germans used mostly 77mm and had bigger guns as well...

That's a rumor spread by the Germans to fuel their master race scenario.