Gotta chime along with the others here. 150 gr is a bit on thelight side unless a good premium bullet is used or shot placement is perfect. Not that it won't drop them in their tracks, its just good to have a bit of insurance. The good 150 and 165 gr would be the Fail Safe or the Barnes X. Both would allow excellent performance from the lighter bullet weight.

I just feel that since you can't count on the elk to be in the right position for that dream shot, you kind of need to up the punch a bit.

My 30.06 is zeroed with 180 gr Accubond bullets. They will shed a bit of weight during penetration so starting with more weight is a good idea. They group around 3/4 inch at 100.

My primary elk gun is a 300 WM with 180 gr Barnes XBT bullets. They are my handloads and at 3000 fps, will group at 5/8" @ 200 if I do my part. If I had to use factory ammo, I would use the 180 gr Fail Safes. They perform great out of my 300 but atabout $1.75 a shot- you see why I reload.