A lot of guys I know are issued Fed GMM for their duty ammunition, and want to duplicate its ballistics for training beyond what they are authorized by their department.
My department issues GMM2--the .308 with the 175 gr. MatchKing. My practice load is 41.5 of RL15 under the 175 grain MatchKing; cases trimmed to 2.000; COAL @ 2.820, with CCI #34 primers. Excellent practice load.