Of the three 150 grain factory loads which bullets are loaded in them? If one had to pick the best one for elk it is hard to say unless you know which bullets the factory put in the cases. For instance I have had more consistent results with Winchester's Power Point than I have had with the current version of the Corelokt. The 150 grain bullet in the cheapest Federal load can vary from a made by Federal bullet to a Speer 150 grain Hotcor. If I had to choose from this ammo I would pick the Winchester Power Point ammo.
Of those choices, I would certainly agree that the 150 grain Power Point performs the best. I did use it to kill one elk with a .308.
The other three elk I killed with a .308 were downed by 165 gr Sierra BT's. These were shot from a 20 in Savage 99E.
The only .308 I have at the moment is a Ruger Gunsie Scout with an 18.3" barrel. If it goes elk hunting it will be using 150 gr Nosler Partitions over RL-15. A couple of in-laws have used the load successfully for several years.
For a 22 in barreled .308 I blieve I would use 165 NPT's
