As for the chrono speeds, if you have the Chrony, like I do, make sure it is opened all the way flat. I didn't check this one time when I was testing a brand new rifle and caliber, to me, the 280, and was overjoyed at the velocities I was getting. Then when I went to collect my chronograph, I notice it was not fully opened, nothing drastic, but looking at it, it causes the two screens to be a fraction closer together than they really should be, thus the faster clock times. I was bummed when I realized this and ALL my numbers were garbage.

I wasn't knocking 150gr bullets earlier, it's just you failed to mention that was the specific bullet you were goiong to use, so it wastes some of the peoples time with other suggestions.

I use a 150gr in my 308 for hunting, so I have no issues with that weight bullet.

Good luck on the next round of shooting.