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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
5R rifling VS Polygonal rifling VS other types of rifling
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<blockquote data-quote="tim_w" data-source="post: 1355514" data-attributes="member: 11132"><p>In major terms its all minor and honestly other than some very specific cases I think accuracy effects are a total wash. Cleaning and a slight peak pressure drop are what I have seen. But that is a very hard test to do properly without buying two identical 5g barrels. One with the R and one standard land shape. Then calibrate each one with P-test equip and see what you get. Issue otherwise is you have different land dimensions/ratios land to groove from different manf which all have and effect when looking at the effects of these changes.</p><p></p><p></p><p>I have tested Polygonals but the only ones I have had to test were PacNor and AR barrel from Noveske which is basically a pacnor. I as well as another person noticed borescoping they ran very large lands ratio to groove dimensions. I did not cast it or slug it to get exact but it had to be approaching 50%. These were 4 groove. I can not really say what effect the polygonal shape had as most all other barrels did not have such large lands. Really all I learned was at least in the 5.56 and .270 4 groove poly they used large lands compared to what I was use to seeing.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1355514, member: 11132"] In major terms its all minor and honestly other than some very specific cases I think accuracy effects are a total wash. Cleaning and a slight peak pressure drop are what I have seen. But that is a very hard test to do properly without buying two identical 5g barrels. One with the R and one standard land shape. Then calibrate each one with P-test equip and see what you get. Issue otherwise is you have different land dimensions/ratios land to groove from different manf which all have and effect when looking at the effects of these changes. I have tested Polygonals but the only ones I have had to test were PacNor and AR barrel from Noveske which is basically a pacnor. I as well as another person noticed borescoping they ran very large lands ratio to groove dimensions. I did not cast it or slug it to get exact but it had to be approaching 50%. These were 4 groove. I can not really say what effect the polygonal shape had as most all other barrels did not have such large lands. Really all I learned was at least in the 5.56 and .270 4 groove poly they used large lands compared to what I was use to seeing. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
5R rifling VS Polygonal rifling VS other types of rifling
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