No two 'identical' barrels produce the same velocity either, further skewing any results. Or rather it could be almost impossible to make identical barrels. I reckon this question could only be answered by a manufacturer using statistics from thousands of testfires...
Something i (if i were them) would never release. The moment it became known that there was a 50ft per second advantage having 1/7 twist on any model, the 1/8 would be chopped liver and hard to sell![]()
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