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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Polygonal Rifling?
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<blockquote data-quote="yorke-1" data-source="post: 1148994" data-attributes="member: 11960"><p>Blackhole Weaponry makes polygonal barrels; I have one on a CZ 527 that I had converted to .264 LBC/6.5 Grendel. It shoots a touch under 1/2 MOA which is perfectly acceptable for this gun since it's just little carbine I had built for my son. I do get higher velocity from the poly barrel than I do from a conventional barrel of the same length, it's not significant enough to make me switch over all of my barrels to poly rifling. I know that polygonal rifled barrels are much more popular with ARs.</p><p></p><p>We did have problems with a polygonal rifled BHW barrel when we stepped up in speed though. A friend and I both had barrels chambered for a 6.5/338 RUM improved (similar to the 6.5 Allen Mag). Mine is a McGowan 1-8" twist 260 Rem barrel that I had rechambered and the other is a BHW 1-8" twist. My barrel shoots the Matrix 160 at 3430fps and groups in the .4 MOA range when I do my part. The polygon barrel keyholes the 160 gr bullets at 100 yards when shot at the same speed. The best answer we can come up with is that the poly rifling just doesn't grab the long, heavy bullet enough to get a good spin on it at those speeds and the bullet is essentially stripping through the rifling. 140gr bullets don't have this problem in that barrel.</p><p></p><p>Speaking of Matrix Ballistics, that alone is reason enough to do business with Canada. I don't know of any US companies making a comparable bullet!</p><p></p><p>Andrew</p></blockquote><p></p>
[QUOTE="yorke-1, post: 1148994, member: 11960"] Blackhole Weaponry makes polygonal barrels; I have one on a CZ 527 that I had converted to .264 LBC/6.5 Grendel. It shoots a touch under 1/2 MOA which is perfectly acceptable for this gun since it's just little carbine I had built for my son. I do get higher velocity from the poly barrel than I do from a conventional barrel of the same length, it's not significant enough to make me switch over all of my barrels to poly rifling. I know that polygonal rifled barrels are much more popular with ARs. We did have problems with a polygonal rifled BHW barrel when we stepped up in speed though. A friend and I both had barrels chambered for a 6.5/338 RUM improved (similar to the 6.5 Allen Mag). Mine is a McGowan 1-8" twist 260 Rem barrel that I had rechambered and the other is a BHW 1-8" twist. My barrel shoots the Matrix 160 at 3430fps and groups in the .4 MOA range when I do my part. The polygon barrel keyholes the 160 gr bullets at 100 yards when shot at the same speed. The best answer we can come up with is that the poly rifling just doesn't grab the long, heavy bullet enough to get a good spin on it at those speeds and the bullet is essentially stripping through the rifling. 140gr bullets don't have this problem in that barrel. Speaking of Matrix Ballistics, that alone is reason enough to do business with Canada. I don't know of any US companies making a comparable bullet! Andrew [/QUOTE]
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Polygonal Rifling?
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