I have a 77MKII in 6.5x55. Only one trip to the range so far and with factory ammo. 140gr Rem, Fed, and Win all three about 1 1/4"
Tried 120gr from GA Arms http://georgia-arms.com group went to between 2 and 3 inches.
I am well satisfied with 140gr cheap factory stuff. The premium stuff will no doubt do better.

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