Quoted: source = hornady's data...200yards for M4, 225yards for 16".
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I got Hornady's data book on the TAP right in front of me (dated 1999 with data taken at 74degF 1800'ASL)
Page 10 is the 14.5" barrel (SIG) with a PUBLISHED range of 125yards. However, if you look at the ranges for the other barrel lengths (as to get the floor velocity for fragmentation) you'll find the expected range should be 150yards. Is there something with Sig's 14.5" barrel or was that particular batch just funky? I don't know. MV was listed as 2518fps.
Moving to page 11 (Bushmaster 1:9 twist 16" barrel) we find the published range of 200 yards (with a MV of 2616fps)
The 20" on page 14 (Steyer AUG with a MV of 2653) has a listed range of 225yards. Then on page 15 it has a Colt 20" (1:7 twist) with a MV of 2663 and again a published range of 225yards
FYI p16 shows a 300y range for the 75 gr from a Savage 24" bolt action.