.276 vs .284
That was two different ways of expressing the same thing. I think the English first routinely expressed it in bore diameter (.256, .300. .303, ...) and later users began to express it in groove diameter (.264, .308, .311, for the same sizes)
I am thinking Winchester might have been first with their .264, .338, .458, .308 etc. giving exact bullet size.
That was two different ways of expressing the same thing. I think the English first routinely expressed it in bore diameter (.256, .300. .303, ...) and later users began to express it in groove diameter (.264, .308, .311, for the same sizes)
I am thinking Winchester might have been first with their .264, .338, .458, .308 etc. giving exact bullet size.