Recently I was informed that while 7.62x51 mm NATO and 308 Winchester cartridges look, to the eye, to be the same, they are not. Also, their chamber specifications I was informed are different. Are these statements accurate?
If they are accurate, does one of the two cartridges become marginally safe when fired in the other's chamber? If this is true, which is which? Were I barrelling a rifle and wanted to assure that whichever cartridge was fired in the rifle was absolutely safe, which [cartridge] chamber would I choose?
If they are accurate, does one of the two cartridges become marginally safe when fired in the other's chamber? If this is true, which is which? Were I barrelling a rifle and wanted to assure that whichever cartridge was fired in the rifle was absolutely safe, which [cartridge] chamber would I choose?