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When comparing the muzzle velocities of quality barrels of the same length, it is the type of chamber (including freebore and leade) used in the barrel that will be the greatest determinant of differences in velocities; not the rifling.
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This is correct. The Noveske barrels have definite lands and grooves and are not of the “polygonal bore” type such as found on Heckler & Koch weapons. With the polygonal rifling of the Noveske barrels the sides of the lands are “ramped” as compared to being perpendicular in traditional rifling (as can be seen in the pictures below.)
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), except your chamber pic is 6 sided (I think, it is hard to tell) and the wiki graphic below is 8 sided:

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