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Bench Mark 3 grove button rifled

 
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  #1  
Old 03-11-2009, 07:06 PM
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Bench Mark 3 grove button rifled

First are 3 grove BBLs tough on bullets? I need a new Barrel for my 6x284 currently I have a Hart and its about shot out? I was thinking of a Cut rifled BBL but speaking to this staff person at Bench Mark barrels has me thinking?
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Old 03-12-2009, 11:28 AM
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Re: Bench Mark 3 grove button rifled

From my experiance the 3 groove barrels are harder on bullets , the lands are bigger and work the jacket more.

If I were planning to build a real hot rod I'd use a cut rifled barrel from either Rock Creek or Bartlein with the 5R rifling , Broughton also makes a 5R barrel but its buttoned rather than cut.

I'm not sure that their is any real differance in barrel life with the buttoned compaired to the cut barrels but I have seen a marked increase in velocity with the 5R barrels over conventional land and grooves.

You can't go wrong with a Kreiger or Brux 4 groove though
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Old 03-12-2009, 11:58 AM
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Re: Bench Mark 3 grove button rifled

Quote:
Originally Posted by Iron Worker View Post
First are 3 grove BBLs tough on bullets? I need a new Barrel for my 6x284 currently I have a Hart and its about shot out? I was thinking of a Cut rifled BBL but speaking to this staff person at Bench Mark barrels has me thinking?
There has been a lot of discussion on this question so do a search on 3 grove barrels
and it will answer your questions.

I have limited experance with 3 grove barrels but the ones I have dealt with are very
good.

Mine have all been slow twist for ultra high velocity (1 in 15).

J E CUSTOM
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Old 03-12-2009, 10:18 PM
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Re: Bench Mark 3 grove button rifled

Yep , their should be alot of info in the search files , I remember Kirby Allen doing some test and such with his Allen mags , If I rememer correctly he had Lilja make some barrel that used thinned lands or somthing for his hot 257 or 270 for use with the realy long Wildcat bullets
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Old 03-13-2009, 07:46 AM
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Re: Bench Mark 3 grove button rifled

Quote:
Originally Posted by James Jones View Post
Yep , their should be alot of info in the search files , I remember Kirby Allen doing some test and such with his Allen mags , If I rememer correctly he had Lilja make some barrel that used thinned lands or somthing for his hot 257 or 270 for use with the realy long Wildcat bullets
James.

Kirby did have problems with the 3 grove barrels but as I understood him to say they
were all fast twist for heaver bullets and the thin jacketed bullets came apart at high velocity.

Based on every ones experiance and recommendations I went with the slower twist for lighter
bullets hopeing I would not have the same problems.

So far I am pleased with the test I have done( break in loads were with 60gr .223 dia bullets)
and they produced a velocity of 3915 ft/sec and a SD of 6.

The next bullets I will try will be 50gr @ around 4200 ft/sec. and then 40gr bullets @ around
4400 ft/sec.

So before I could recomend 3 grove barrels I have to do more test.

I am still hopeing my experment is a success.

Thanks
J E CUSTOM
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Old 03-13-2009, 09:21 AM
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Re: Bench Mark 3 grove button rifled

IronWorker is talking about an 8 twist, I'd cal that a fast twist. He also is talking about a 6-284 with High BC bullets driven fast.
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Old 03-13-2009, 03:52 PM
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Re: Bench Mark 3 grove button rifled

Quote:
Originally Posted by jwp475 View Post
IronWorker is talking about an 8 twist, I'd cal that a fast twist. He also is talking about a 6-284 with High BC bullets driven fast.
Yes I hear you .

Not sure how fast the 6-284 will push the bullet he wants to use.

Maybe Kirby will chime in and render his opinion on this combination.

We all seem to gravitate towards fast twist barrels because of the bullets we
use for longrange hunting/shooting so this was a leap of faith for me going to
a 1 in 15 twist.

J E CUSTOM
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Last edited by J E Custom; 03-13-2009 at 10:34 PM.
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