Try a Sierra 110 grain! Those are faster!!
You shoot those? Ever shot a 155?
What do you like out of your 300?
If there had been a sarcastic icon available about using a 110 grainer....I would have used it!!
A 155 grain makes a lot of sense to me in a 308 Win since I've shot THOUSANDS of them in Palma matches but not out of a 300 Mag...which I don't need!