Yes.
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1100-1300 ft/sec
pi*65 which is just over 204 mm
The thirty-aught-six (30-06) bullet diameter is .308 in (7.62 mm) The "30" designates the projectile as 30 caliber, whilst the "06" indicates the year the round was adopted and standardized by the US Military.
27
Not at all. Remember, at one time the sizes of coins were proportional to their values so a Morgan dollar is (essentially) twice the size of a Kennedy half dollar. Specifically, Morgan dollars are 38 mm in diameter and weigh 26.7 gm when new. JFK halves are 30 mm in diameter and weigh anywhere from 11.34 gm to 12.5 gm depending on their metal composition.