Re: Most accurate hunting bullet
Jon, the coating on the BST is not moly, and brake cleaner removes it from your bore very easily.
Since you have limited the bullets that can be suggested, Ballistic Tips. But given the .270WSM potential velocity with heavier higher BC bullets I would try the 150 gr BT. At 300 yds on whitetails it really does not matter but close the 150 gr would penetrate better and would loose it's velocity slower and have less wind deflection at long range.
What you have been told about flat base bullets being more accurate than boattails is true but only is important if you wish to reduce your 100 yd group by every .0001" possible. At long range the higher BC of the boattail will help you.
If I might offer one additional piece of advice, just try the 135 gr Match King on wet newsprint at 300 yds or perhaps a goat or sheep for your freezer.
Rapid fire is the crutch of an incompetent marksman. ONE SHOT, ONE KILL