My 6.5x284 has a 1:7.5 twist, so stabilization wasnt a problem. It also shot well for me with Ramshot Magnum at 2750 fps. I know not a 6.5x55- just info about accuracy in my rifle.
Last year, large whitetail doe at about 50 yards, quartering away shot.
Exit hole
Chest cavity, notice hole in heart and off side lung soup (poured out)
Exit hole
So far (sample of 1), I have been pleased. Hopefully I will have another whitetail volunteer this coming weekend.