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How many groove barrel for 7mm wsm

 
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  #8  
Old 03-22-2013, 06:12 AM
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Re: How many groove barrel for 7mm wsm

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Originally Posted by Daveinjax View Post
I am debating the merits of 3 groove vs. 5 groove. I'm hoping someone here can discuss the reasons for the differing number and how to choose which is right for for my application. I know guys win with all differing groove paterns and I could go with what I know will work but I keep hearing threads mention higher velocity with some 3 groove. So why not 3 groove vs 5R and is it common to pick up a few fps ?
(C&P -- Barrel FAQ -- Barrel Velocities, Lengths, Twist Rate, Contours, Cleaning, Accuracy and Ballistics for Benchrest, Hunting, Precision Shooting)

What Is the Best Number of Grooves? Barrel-makers report that, as long as the ratio of lands to grooves is relatively constant, there is no demonstrable difference in accuracy among 3-,4-,5-,6- and 8-groove barrel designs. Krieger has told us "There isn't any advantage to the shooter. Assuming the ratio of the surface area is kept the same, the number of grooves should not have any effect. Barrel makers use different numbers of grooves for ease of manufacturing and ... marketing hype." That said, in our experience, 8-groove barrels are a little slower, and may foul a bit more quickly because there are more edges to cut into the bullet's jacket and to trap powder residue. We see no reason not to specify a 4-groove barrel if that is your preference. Moreover, IBS Hunter Champion Al Nyhus and others have had great success with Lilja 3-groove barrels. Al believes the 3-groove design cleans up more quickly and yields a bit more velocity. Famed gunsmith and wildcatter P.O. Ackley believed that, all things considered, a properly-made 3-groove barrel is optimal for most common calibers. Ackley believed 3-groove profiles can deliver higher velocities with less fouling and no significant reduction in accuracy. In the months ahead, 6mmBR.com plans to do a comparison test of various barrel formats.

I have a 30" Lilja 3-groove in my .270AI, I've shot <100 rounds but am very happy thus far.
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  #9  
Old 03-22-2013, 07:45 AM
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Re: How many groove barrel for 7mm wsm

That's what I needed , thanks. I think l will try the 3 groove and develop my own opinion.
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  #10  
Old 03-22-2013, 08:25 AM
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Re: How many groove barrel for 7mm wsm

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Originally Posted by Bart B View Post
Yes.
Thank you! Good to know.

Jeff
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Old 03-22-2013, 09:19 AM
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Re: How many groove barrel for 7mm wsm

All my custom barrels, from now on, will be Rock Creek (Mike Rock) barrels with 5R rifling.
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  #12  
Old 03-22-2013, 09:19 AM
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Re: How many groove barrel for 7mm wsm

Quote:
Originally Posted by Daveinjax View Post
I am debating the merits of 3 groove vs. 5 groove. I'm hoping someone here can discuss the reasons for the differing number and how to choose which is right for for my application. I know guys win with all differing groove paterns and I could go with what I know will work but I keep hearing threads mention higher velocity with some 3 groove. So why not 3 groove vs 5R and is it common to pick up a few fps ?
I have both type barrels and I like both. For many years the 5R was locked in with Obermeyer he has the rights to that and he's let those rights out to some over the years and their very few making that type barrel. I have Obermeyer,Kreiger,Bartlein and Mike Rock 5r barrels also Broughton 5c and Shilen Ratchet rifled 4 groove. I also have some rifles with Lilja 3groove.

I've always like the 5r barrels been pretty hard to get at times. My last build used Rock 270 5r was a long wait. I put Lilja 3groove barrels on 280AI,284,270,30-338mag. My first 300WSM used a Broughton 5c barrel and lastest one used Krieger 1/11.25r and I was going to do a 7WSM looked at Bartlein 5r barrel for that but opt for the 280AI/284 with the Lilja.


Well good luck
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