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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel manufacturer?
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<blockquote data-quote="tim_w" data-source="post: 1456813" data-attributes="member: 11132"><p>Actually I think you may find its not just the number of grooves but also the surface area ratio of the grooves to bore. You can have a 4 groove with 50% groove 50% land. You can also have one with 75% groove 25% land. The latter will allow higher vel at lower pressure all else being equal. The engraving and friction force can also be effected if the lands are opposing or offsett i..e odd vs even groove/land. </p><p></p><p>Of course there are no free lunches. The larger the individual land section the longer it will last against throat erosion. But with very fast vel bullets the larger and less number of lands the harder it is on bullet jackets causing them to fly apart.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1456813, member: 11132"] Actually I think you may find its not just the number of grooves but also the surface area ratio of the grooves to bore. You can have a 4 groove with 50% groove 50% land. You can also have one with 75% groove 25% land. The latter will allow higher vel at lower pressure all else being equal. The engraving and friction force can also be effected if the lands are opposing or offsett i..e odd vs even groove/land. Of course there are no free lunches. The larger the individual land section the longer it will last against throat erosion. But with very fast vel bullets the larger and less number of lands the harder it is on bullet jackets causing them to fly apart. [/QUOTE]
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Barrel manufacturer?
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