Greetings Micky,
The .270, 6.5 06, 6.5 x 55 and likely others have the happy knack of putting a range of projectiles through the same point of impact. My experience with the .308 Win shows that it is not in that group of cartridges. A 300 mm group would be more like it with each load tight but just in a different place.
Regards Grandpamac.
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