has any one used Polygon rifleing in rifle cailbers befor ???

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25 November 2010, 05:33

500MagMan

has any one used Polygon rifleing in rifle cailbers befor ???

I am looking to bild me a new .260 Remington on a FN action and was wondering if any one has used Polygonal rifing in a rifle .. I was looking at a 1-8.5" twist Pac-Nor and seen they had that option and was wondering if any one has used that type of barrel on a rifle befor.. I know that in hand guns they are very accurate... I am not going to be using cast bullets.. and was thinking of a 1-8.5" for the range of bullets I plan on using 100gr to 160gr

25 November 2010, 06:56

308Sako

My wifes H&K 770 in .308 is a polygonal bore and it shoots well, but I don't know how cast bullets would react. I do think thye shoul dbe very good as the bullet is distorted somewhat less, differently for sure.

Ask the barrel manufacturer.

25 November 2010, 08:41

mete

Cast bullets are not recommended for polygonal rifling.
I think the care in manufacturing will make the difference -a good barrel is a good barrel egardless of the rifling.

25 November 2010, 15:04

DocEd

I have had excellent results with Schneider 5P rifled barrels in both 6mm and 308.

25 November 2010, 16:17

D Humbarger

My H&K 91 has one & shoots extrmely well.

25 November 2010, 22:10

butchlambert

Shilen made them in the past and it is available for rimfire. According to Ed Shilen you need to be careful with your cleaning methods.
Butch

26 November 2010, 06:20

500MagMan

I am strickly going to be using Jacketed bullets and I only use Pachs and Buctches bore shine or shooters choice.. No bushes abd no lead bullets for me.. Pac-Nor says they work very nicely so I am thinking of taking a chance and try it out... Just realy hard to make up my mind that or a 3 land 1-8.5"

27 November 2010, 23:16

butchlambert

If you said no brushes, you may want to rethink that.
Butch

28 November 2010, 00:48

SmokinJ

Didn't HK drop the polygonal rifling in their 91 because they said it created a pressure problem?

I believe the don't shoot cast in them is a myth perpetrated mainly with the Glock blowups.

29 November 2010, 23:44

390ish

used to call it metford rifling. think it got to be too expensive around the turn of the century.

01 December 2010, 01:18

walnut

What is polygonal rifling?

02 December 2010, 03:48

butchlambert

Looks like you could put an Allen wrench in the barrel to tighten it. I have seen them with a hexagon and octagon rifling.
Butch

03 December 2010, 17:38

Ammoloader

quote:
Originally posted by 500MagMan:
I am looking to bild me a new .260 Remington on a FN action and was wondering if any one has used Polygonal rifing in a rifle .. I was looking at a 1-8.5" twist Pac-Nor and seen they had that option and was wondering if any one has used that type of barrel on a rifle befor.. I know that in hand guns they are very accurate... I am not going to be using cast bullets.. and was thinking of a 1-8.5" for the range of bullets I plan on using 100gr to 160gr

David Tubb who has now earned the national high power championship 11 times now Schneider polygonal rifled barrels. After reading through what he has written on the subject, I would summarize it by saying that he believes they offer advantages over conventional barrel rifling in high power competition.

04 December 2010, 02:00

6.5BR

Pac-Nor did a 7BR rifle, and a 6BR both w/3 groove Poly. Both shot very well, no complaints.

04 December 2010, 19:08

walnut

quote:
Originally posted by butchlambert:
Looks like you could put an Allen wrench in the barrel to tighten it. I have seen them with a hexagon and octagon rifling.
Butch

I would think the diff between the across corners and across flats would be greater than the depth of land / groove rifling. Interesting. Thanks, BL.

18 December 2010, 23:17

stepchild 2

I have a Shilen Polygon on a LA700 and love it. It's fast, cleans easily and accurate. .257 Ackley

Stepchild

19 December 2010, 21:11

butchlambert

Wow stepchild2! Your barrel was produced pre 1984.
Butch

19 December 2010, 23:20

enfieldspares

quote:
Used to call it metford rifling. think it got to be too expensive around the turn of the century.

Metford rifling was dropped at the turn of the century because the steel was too "soft" to resist the cordite erosion.

If you see an old Metford rifled 303 that has had a lot of cordite use the barrel is almost smmothbore!

In a good modern steel that would not be an issue.

20 December 2010, 20:42

stepchild 2

quote:
Originally posted by butchlambert:
Wow stepchild2! Your barrel was produced pre 1984.
Butch

Butch,
The rifle was built in the late 70's as I remember. It's been a while.

Stepchild

20 December 2010, 23:03

carpetman1

I don't know if it was the first, but the Whitworth rifle was patened in 1854 and had a poly barrel. Now you can't use cast bullets in one? What jacketed bullets did they have in 1854????

21 December 2010, 18:22

huffmanite

Think my 6.5x50 Japanese type 38 Arisaka has Medford/polygonal rifleing.

25 December 2010, 09:09

bluedot

I had a pacnor with polygonal rifling in 25 wsm, was very accurate and cleaned easy.

25 December 2010, 11:18

a.tinkerer

I used to have an HK sporter in 22wmr
It shot into a half minute pretty much always.

I own a WR double rifle from the early 1860's, it's a sixteen bore rifle with Whitworth patent (polygon) bores, complete with patent use number on the barrels.
It's a brute.

Cheers
Tinker