Talk:M634 Experimental High-Powered Semi-Armor-Piercing
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Note on Ammunition Cartrage Designations:
The second number in a cartrage designation does not necessarily indicate it's length. For some rounds it is the bullet wieght, or powder charge as in the 45-70 a US service cartrage from the late 19th century and for some like the 30-'06 it stands for the year of its military adoption 1906 and some cartrages have no second number like the 308 Winchester (7.62 Nato) or the 45ACP. It can also be just a naming nod to the origins of the round like the 7mm-08 Remington that was originally a wildcat cartrage made from 308 Winchester brass. Also there are lots of rifle cartrages that exceed 9mm even the above mentioned 45-70. Dagger133 01:24, 3 April 2007 (UTC)