My 6.5-300 Wby Accumark (26” bbl) shoots some better than others. I got the best out of the 140gr ABs and the 156gr Berger Hunters. Generally, 1/2" – 3/4".

Per Labradar: the factory-loaded 140gr ABs came out at 3,308 fps, and the 156gr Berger Hunters came out at 3,060 fps.

This is what it should look like at 10,000 ft (elk hunting where I go):

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]