Here is M262 vs ...

http://web.archive.org/web/200708040...ballistics.pdf

Here is M855 from Kyle Lamb's book.

M855.pdf (133 KB)

Maybe those links are also interesting.

http://designatedmarksman.com/files/...ory%20NSWC.pdf

http://www.dtic.mil/ndia/2008Intl/Roberts.pdf