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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
# of Grooves
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<blockquote data-quote="Fiftydriver" data-source="post: 69914" data-attributes="member: 10"><p>7ultra,</p><p></p><p>Accuracy wise you will probably never see a difference between all three.</p><p></p><p>I use 3 groove barrels in all my sub 30 cal high capacity rifles especially the likes of my Allen Mags simply because they offer increased throat life compared to the other designs.</p><p></p><p>This is because the land is wider and has more steel in it so it takes measurably longer to erode compared to a 5 or 6 groove.</p><p></p><p>Another benefit 3 groove is slightly higher velocity but other variations can cause this to vary from barrel to barrel so do not expect to gain 100 fps simply by using a 3 groove barrel.</p><p></p><p>From my testing and experience, I would say that 3 groove barrels copper foul less then the other designs simply because there are fewer edges and less distortion in the bullet as it passes through the bore.</p><p></p><p>Again, with top grade match barrels that are properly broken in, this will not be an issue with any of the designs.</p><p></p><p>Now for your little 7mm BR, which I think would be a kick in the rear in a rifle mind you, I would go with the 3 groove for the reasons above but to be honest, you will probably never burn the throat out nor will you produce enough velocity to lay down alot of copper fouling.</p><p></p><p>Still, I would go with a 3 groove just because /ubbthreads/images/graemlins/grin.gif!!</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 69914, member: 10"] 7ultra, Accuracy wise you will probably never see a difference between all three. I use 3 groove barrels in all my sub 30 cal high capacity rifles especially the likes of my Allen Mags simply because they offer increased throat life compared to the other designs. This is because the land is wider and has more steel in it so it takes measurably longer to erode compared to a 5 or 6 groove. Another benefit 3 groove is slightly higher velocity but other variations can cause this to vary from barrel to barrel so do not expect to gain 100 fps simply by using a 3 groove barrel. From my testing and experience, I would say that 3 groove barrels copper foul less then the other designs simply because there are fewer edges and less distortion in the bullet as it passes through the bore. Again, with top grade match barrels that are properly broken in, this will not be an issue with any of the designs. Now for your little 7mm BR, which I think would be a kick in the rear in a rifle mind you, I would go with the 3 groove for the reasons above but to be honest, you will probably never burn the throat out nor will you produce enough velocity to lay down alot of copper fouling. Still, I would go with a 3 groove just because [img]/ubbthreads/images/graemlins/grin.gif[/img]!! Good Shooting!! Kirby Allen(50) [/QUOTE]
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# of Grooves
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