>>64018890
Sure, but how much is America's supply chain of sidearm ammunition going to make a difference for or even be relevant to that of Britain's, Germany's or Norway's? All four countries could have sidearms in different calibers and it would basically not matter at all.
None of these countries are going to be using each other's ammunition supply chains for sidearms regardless of if they have the same caliber or not, because they're sidearms.