For example he states that assuming a mach number of = 2.5 (or roughly 2800 ft/sec assuming standard conditions at sea level where 1 Mach is roughly 1116 ft/sec) is a safe value to use in regards to velocity.
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The rule of thumb that Greenhill devised based upon his formula is actually what is seen in most places, including Wikipedia.
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So our rifling should be roughly 12" per turn. The twist, as listed on Wikipedia's .30-06 article is 10" inches per turn as an average of .30-06 caliber rifles; thus 12" inches per turn is fairly accurate.
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