I always use in my sl7 Federal 150 .308 Power Shock and it groups well with this type of load. I never can remember if you can use .223 in a 5.56 or the .308 in 7.62 or visa versa, so for this reason, I use what it states on the HK weapon. My SL7 says .308 and that is what I use. I think both the 5.56 and 7.62 have higher pressures than the .223 and .308 and in later models of the hk91 and hk93 they changed to the NATO rounds, so I would say you could use them, but to be on the safe side, I just stick with the .308 and .223. This load of .308 seems to do well and I have had no problems with my SL7. If I ever figure out how to post photos, I will have my last range session with the sl7. It did well, slings the brass like every HK delayed roller locking rifle. By the way, these are great rifles and one of HKs best kept secrets. Too bad they do not make them any more.