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Polygonal
Dec 26, 2015 20:39:49 GMT -5
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Post by linebaugh on Dec 26, 2015 20:39:49 GMT -5
Is there anybody on here running the polygonal rifeling and full forming? Just going through the thought process on another build and I see the polygonal is an option. I have one lothar walther polygonal barrel on an airgun and it shoots excellent. I was just curious if ff sizing may be easier with this type of rifling and any results you vuys might have seen.
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Post by Richard on Dec 26, 2015 20:44:21 GMT -5
I thought I read either here or on Doug's about someone using that type of rifling.......Maybe McGowan45 (Carlos?) Not sure?
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Dec 26, 2015 20:51:17 GMT -5
It is subcalshooter that has one on dougs. aka ohioguy. I have done some reading on those and they sound intriguing.
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Polygonal
Dec 26, 2015 20:58:58 GMT -5
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Post by linebaugh on Dec 26, 2015 20:58:58 GMT -5
I would be mostly interested in FF but also since I am asking what do they consider the minor diameter on this type of rifling? Would there be a nominal .008 difference from... ummm "land to grove" or whatever that terminology is with that type of bore.
You guys really need to try this so I can spend my money wisely. Lol
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Post by keith on Dec 26, 2015 21:31:52 GMT -5
Yeah, Guy used one on a .40 SML. I have used them for metallic guns with good success. I'm not sure if the minor diameter is .008 under major or not. My only caution against poly or 5R barrels is you need to shoot bullets with enough bearing surface but since most of the bullets we shoot are pistol type bullets (in the subs) or spires then they have enough length. My 300gn bullet, which is short shanked, is not something I would shoot from a poly or 5R if one were available just like a 55gn .224 NBT doesn't do really well in a 5R on average. YMMV.
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