US General Julian Hatcher wrote of this and many other related topics. I am sure he included this very (Millers) formula in his book: Hatchers Notebook. This has the best book written on the subject of anything to do with rifles and projectiles. Amazon have it listed here: Hatchers Notebook
I have a copy of Hatcher's Notebook and it is a must have for any firearm library.
Miller's formula is not in it as Don Miller published his formula in 1995.