I just measured my best group from the last match and 5 shots were in a .540" group but 4 of those were in a .210" group. The funny this is that the lone hole hit the X so that helped the score
The other 4 were over near the edge of the 10 ring.
Now remember, this is at a BR match with all sorts of windflags and other junk out there to help predict where the bullet would end up. Just putting bullets out the bbl with no windflags and expecting to regularly shoot tiny groups is unrealistic.
ETA: Opps, my rifle is chambered in Mach II not HMR. Some people say the M2 is more accurate than the HMR . It's definitely cheaper to shoot !