McMillan is one of the best, if not THE best, TRUE synthetic stock builder - so good choice.
That said, I have a McMillan stock on my .375H&H. The action was glass bedded, the barrel was free floated, and the gunsmith also installed aluminum pillars to pillar bed it.
Let just say that the accuracy of my .375H&H would surprise even the most experienced of varmint hunters!! :grin:
Zachary