This is principally a benchrest type question.
I think David Tubbs is marketing and hyping a new coating of boron nitride.
At one time in my life I shot the 6mm Barnes blue meanies and killed several deer with them. I found no difference in the final resting stage of the deer compared to 85 grain Speers without any coating. Rifle was a 240 Wby and the range was seldom more than 200 yards so 50 fps difference in screaming hyper velocity was not noticeable.
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The man in black fled across the desert, and the gunslinger followed.
SFA M-9545
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