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I need help with barrel understanding

 
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Old 07-12-2004, 07:32 AM
 
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I need help with barrel understanding

I'm going to start ordering parts for a new rifle build that I want to have done but I'd like to get a better understanding about some barrel questions I have.

Since I have been a member here I have heard alot of talk about barrels with a 5R twist in them and how their better for velocity and bullet stability , I would think that maybe because that the lands are dircetly accross from a groove that this may but less stress on the bullet by way of comperssion but is their any real facts to this ?
What benifit does a 5 groove have over a 3 groove ? I have barrels with 8,6,4 and 6 grooves but all are in differant calibers so no accurate compairison can be made in bore erosion , I can say that the 8 groove has shown alot of wear quickly for the caliber it is (260)I'm not sure if its from the material or the amout of grooves.
I'm going to be building a 308 in a tactical version and I'd like to have it as accurate as possible so I'm not going to skimp on the tube , I was thinking either Kreiger or Hart due to their long great records but I have also heard so many great things about the Mike Rock barrels and Benchmark because of the 5R rifling.

If any of you outstanding fellows can help me out or offer any advice or experiances it would be greatly apperciated.
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Old 07-12-2004, 08:14 AM
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Join Date: Jul 2003
Location: Central PA
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Re: I need help with barrel understanding

For a 308, you really can go wrong with any mentioned. I have used Douglas/hart/kreiger and will probably try Kostyshyn, Schneider and broughton in the near future.

The rock 5r's get a little better velocity usually because they are supposedly a little tighter bored.

you really can go wrong though.

JB
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Old 07-12-2004, 08:25 AM
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Join Date: May 2004
Location: MD.
Posts: 225
Re: I need help with barrel understanding

JD
I can only speak for the Hart Barrel. A friend of mine has a barreled action that belonged to a member of LRH. It's a 700 action with a Hart heavy 4" straight from receiver with a straight taper to .950 (26"). It has a .340 neck chamber B.O. Metal with Robar finish. I just recently bedded it into an H.S tactical stock. It shoots better than it looks. He shoots factory ammo (B.H. or Federal) all shoots very well. The B.H. 175's shoot the best. The last time out dead calm no wind we both shot several groups around 1/2" at 200 yards. The Pact Crony also showed B.H. to be the most consistent ammo I've seen out of a box!! The 340 neck had a hard time with a batch of federal ammo that had a slight outside neck burr.
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Old 07-12-2004, 01:00 PM
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Join Date: Jul 2003
Posts: 150
Re: I need help with barrel understanding

O.K. but what about the 5R rifling? I am considering a Rock 5R this winter after Hunting season. A lot of members here are 5R rifling fans but what advantage does 5R have? I have heard 5R rifling improves accuracy because it produces uniform bullet deformation. Anybody?
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  #5  
Old 07-12-2004, 01:30 PM
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Join Date: Dec 2001
Posts: 787
Re: I need help with barrel understanding

I've got a Broughton 5r in 30 cal 1/12 twist for a 300wsm (hunting rifle)and this is my first 5r barrel. Tim talked me more or less into it and one of the advantages is alittle more velocity and better suited for boat tail bullets. I can get my velocity right up with a 300wby. Obermeyer (sp) also makes 5r barrel but don't know about the wait. If it was me I'd kind of pick a bullet I want to shoot then call who ever you use and pick his brain as to what twist and grooves etc. Your limited as to 5r barrels manufactors but there are lot of good barrels out there. Well good luck.
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Old 07-12-2004, 01:38 PM
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Join Date: Feb 2004
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Re: I need help with barrel understanding

I have a Broughton "5c" barrel on my Remington 700 in 308. The 5c rifling is the same rifling type as the Rocks or Obermeyers. Practically zero fouling (100 shouts will clean up with a few patches and Sweets). As far as velocity goes, In a 24inch barrel im getting 2700fps with factory loaded Black Hills 175's. Accuracy is easily under 1/2 minute with the Black Hills 175 loading and thats about as good as I can hold anyway. Check out the Broughton Website (www.rifle-barrles.com)and shoot Tim North an Email if you have any questions. He is a super nice guy and will get back to you ASAP.

[ 07-12-2004: Message edited by: Stewart ]
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  #7  
Old 07-12-2004, 04:46 PM
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Join Date: May 2001
Location: Urich, MO
Posts: 838
Re: I need help with barrel understanding

The 5R does these things: (from Rock or Obemeyer)
1.More velocity- they are tight bored.
2. Deform the bullet less due to land opposing the groove and the leading edge of the land has an angle to it. Instead of a square 90 degree. I believe it is 80ish. Some people think the R means radius but it in fact means Russian. It was developed in this country by Boots Obermeyer. Rock learned from Boots and goot his blessing to do the 5R, the Broughton 5C is a little different as is the 5P from Schneider.
3. They break in extemely quick 3-10 shots.
4. They do last longer being cut rifled. The grooves are deeper than a button barrel.
Mike Rock has a M24 barrel from the Army (He held the contract for the M24 sniper rifle) that has over 65,000 (no that is not a typo) rounds on it- it has 4" of rifling at the muzzle. It just broke the 1 MOA standard of the Army. How's that for barrel life.
5. They clean extremely easy due to the sloped land- no corners to scrub crap out of.

Hope this helps...I spent a week at Rocks shop making barrels and built over 300 rifles on a 5R barrel.
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