In theory, shouldn't the same bullet whether launched from any barrel of the same twist and length at the same velocity have the exact same ballistics.
For Example:
A 220gr cast bullet of the same alloy, BC etc shot from a 300AAC, 7.62x39, .308 or 30-06 at 1050fps from a barrel of the same twist and length should essentially be the same "gun".
I must be getting cabin fever. and it's only mid December