A score of 127 means your average shot is a 6. The MR 6-ring is 8 MOA. Check your load benchrest at 100 yards. If it's producing better than 8 MOA there, the problem is your shooting and wind estimation, not the load or rifle.

The 2190 fps load should be adequate to stay supersonic to 600 yards but you should be working up a load that groups well from the bench in your rifle, rather than trusting the "most accurate load" suggestion from Nosler (which was undoubtedly developed with a different bullet and rifle - and may just reflect the load producing the lowest velocity deviation in their testing).

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