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I got Billys Marrs 6mm TCU barrel and I shoot mostly 107 or 95 grain bullets. I got 2000 rounds of Sierras 80 grain boat tail on an good deal. I cannot began to get to boat tails even close to the rifling. But I am getting great groups never the less. I group the 80 grains just as good if not better than the heavier bullets. I think you may be asking to much of the 80 grains to touch the rifling. I will wait for more experienced folks to answer your post. Then we can both leard something
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