Be very very careful on duplicating Mil loads, I agree fully with thre foregoing posting. Some Chinese Norinco 223 are worse and blow-ups have occurred over here. So much for "cheap ammo" most people give for a reason for buying a 223 over a 222 !
The SS109 is the NATO/Aus/NZ standard now, but the terminal ballistics are poor for it is too penerative, in my opinion, to be a good stopper in all cases.
As a target round I have heard from the Club they are very good, even in windy conditions vs the 308W up to 600 yds.
Er...Why do you think they were surplus in the first place..?