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One reason for octagon profile that I have not seen suggested is that it could help keep the barrel locked in place during the rifling process. Go to 10:00 in the video, you'll see Mr. Gussler clamping the barrel to prepare to cut the rifling. If you imagine the torque that is applied to the barrel during the rifling, you can imagine that clamping to a flat surface will help. In Gussler's video he has a rifling guide with 7 grooves. However, it is possible that a guide could be made with 1 groove, and instead of rotating the guide, the maker could rotate the barrel, producing 8 groove rifling.
One reason for octagon profile that I have not seen suggested is that it could help keep the barrel locked in place during the rifling process. Go to 10:00 in the video, you'll see Mr. Gussler clamping the barrel to prepare to cut the rifling. If you imagine the torque that is applied to the barrel during the rifling, you can imagine that clamping to a flat surface will help.
In Gussler's video he has a rifling guide with 7 grooves. However, it is possible that a guide could be made with 1 groove, and instead of rotating the guide, the maker could rotate the barrel, producing 8 groove rifling.
