For some reason America has had to dumb measurements down. One American one metric. I still know mechanics that won't work on newer cars because they can't navigate the metric system. That being said there actually half the number of wrenches for any one given length. Like 1 inch. 10 American wrenches for four metric. That's a real stumper. We have used the so called caliber and year it was adopted as the name for the cartridge. Like the 30-06, 30 caliber put into military service in 1906. Thus 30 caliber, year of 06. It hard for this country to go from one measurement system to the other. You might have covered this in your original post. When it comes to old timers you can forget it. I wish we would go to the metric system. Having to have two of every type of tool is a pain in the ass. Same with ammo. Just one system of identification would be a lot easier. To make long rant short, I agree!
