Mr Lyman says:

150gr / .308" / 30 cal. bullets
IMR4350 - 49.0 to 57.0gr.

Why would you start so close to the top?
Try starting around 50.0. Load 4 rounds.
Then, load 3 of each - 50.5, 51.0, 51.5, 52.0, 52.5 - for a total of 5 groups of 3 each.
I'll bet you a nickel - heck, I'll even go a whole dime one of those 3 round groups will be the size of a quarter.
Providing you do your part to the very best of your ability.

Don't forget to let the barrel cool a little between groups.

This concludes this evenings OCW lesson in OCD Reloading.