There are such things as slow barrels but there are a number of other things that could maybe effect your results.
What chrony were you using?
How fresh are the batteries?
What was the light like? Was it consistent or intermittent cloud?
Were you shooting at the same target from the same position as your mate?
Were you using the same batch of ammo?
How fast did you shoot your string?
How fouled was your barrel prior to shooting? If clean it could take a number of shots to foul.
Did the velocity increase as the barrel warmed?
What was the ES like?
Shoot it again on another day. If velocities are the same then maybe you con problem solve from there.
As for you .260 I would just be happy with the accuracy.
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