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Polygonal rifling?

 
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  #1  
Old 02-24-2011, 11:26 PM
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Polygonal rifling?

I'm inching closer to pulling the trigger on the build project on my Sako TRG-S. My gunsmith has been wanting to get me into a polygonal rifling barrel. I don't have any experience with polygonal rifling. My perception is that the it might extend barrel life? I've read differing opinions that it might improve accuracy, but I really do not see how. Is it just a matter of preference or are there some major considerations that I am unaware of? It is a .338 Lapua if that makes any difference. I am looking at a 1/10 twist although Pac-Nor has a 1/8 barrel listed on their sight for .338 Lapua. That seems a bit fast to me.
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Old 02-26-2011, 05:27 PM
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Re: Polygonal rifling?

What choices does that leave you with?
Who makes a REAL polygonal RIFLE barrel other than H&K and possibly LW?
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Old 02-26-2011, 05:36 PM
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Re: Polygonal rifling?

I have heard from most reports that there is a slight gain in velocity to be had,go for a 1-9.3 or 9.5 twist if you plan on shooting the 300's.
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Old 02-26-2011, 05:40 PM
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Re: Polygonal rifling?

Is he talking true polygonal or the canted rifling such as the 5r, 5C.

Broughton makes a great 5C.

BH
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  #5  
Old 02-26-2011, 06:58 PM
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Re: Polygonal rifling?

I don't have any hands on experience with it,but I had seen polygonal rifling on two muzzleloaders that were manufactured in the early 1800s. They were both 50cal and I would guess used 200-300gr projectiles, but thats just a guess.

I would think that although polygonal rifling may not be new it should be effective, especially in the recommended twist rates. Less shearing of gilding metal should make it easier to clean too.

If you decide to go that route a nice writeup with pics would be appreciated!
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  #6  
Old 02-26-2011, 06:58 PM
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Re: Polygonal rifling?

I do want to shoot 300s so I will look into a 1-9.5. I don't know who the barrel mfg. is that he gets his from. I'll ask about that. They are true polygonal rifling.
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  #7  
Old 02-26-2011, 07:26 PM
dwm dwm is offline
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Re: Polygonal rifling?

Pacnor sell barrels with what they call Polygonal rifling....
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