My DD M4V7 shoot the Federal Fusion .223 62gr really well. It is not the MSR version but I'm not sure what the real difference is between the two but it shoots lights out.
https://www.federalpremium.com/ammunition/rifle/family/fusion/fusion-rifle/f223fs1
https://www.federalpremium.com/ammunition/rifle/family/fusion/fusion-rifle/f223fs1