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280AI barrel questions

 
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  #8  
Old 06-05-2012, 04:28 AM
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Re: 280AI barrel questions

My wife's 280AI has a Kreiger 1/9 twist barrel and the one I had build used a Lilja 1/9 twist barrel and both are good barrels and I also used a Lilja 1/9 twist for the 284.

Lots of good barrel being made today my lastest build use a Mike Rock barrel.
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  #9  
Old 06-05-2012, 08:28 AM
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Re: 280AI barrel questions

Quote:
Originally Posted by bamadawg2009 View Post
I probably will start a s**t storm but mine has a 5.5 contour Shilen finished at 25.5" with 1-9 twist shooting 140gr. bergers best group to date is .336 and I think it opened up a little because of me. The Shilen barrel impressed me so much Im having a 300WSM built with a Shilen #5 contour barrel on it.
The Shilen Select Match barrels are actually pretty darn good so I am not suprised you are seeing great results. The standard Shilen barrels are a bit more of a gamble as to what you get in the end. You pay more for better consistancy in the barrels.

In all honesty, I have even used some A&B barrels that cost around $80 that produced legit 1/2 moa rifles. What you get with the top name match barrels is barrel to barrel consistancy, proven accuracy, extremely fine bore finish. With the lesser quality/cost barrels you often will have more work in barrel break in as well simply because they do not take the time to put a really fine hand lapped finish on the bore.

Simply put, it often falls on the shoulders of the guy building the rifle as to how it will shoot more then what brand of barrel you use. Most modern rifle barrels have the potential to shoot to 1/2 moa consistancy, IF they are installed properly.
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  #10  
Old 06-05-2012, 08:45 AM
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Re: 280AI barrel questions

Quote:
Originally Posted by bamadawg2009 View Post
I probably will start a s**t storm but mine has a 5.5 contour Shilen finished at 25.5" with 1-9 twist shooting 140gr. bergers best group to date is .336 and I think it opened up a little because of me. The Shilen barrel impressed me so much Im having a 300WSM built with a Shilen #5 contour barrel on it.
Got a question you were looking for a reamer so are you chambering your own rifles?
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  #11  
Old 06-05-2012, 04:26 PM
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Re: 280AI barrel questions

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Originally Posted by TOM H View Post
Got a question you were looking for a reamer so are you chambering your own rifles?
Nope my gunsmith thats building my new 300WSM didn't have one and said he doesnt build enough rifles in that caliber to have one, so I was seeing if I could find one cheaper than new but I went ahead and bought a new PTG reamer. The Smith that built my 280AI rented one if I had known this I would have spent the $120 and bought one then sold it to him when he was done with my rifle.

I wish I had the know how and equipment to start building my own rifles, I would really be in the POOR HOUSE then.

FIFTYDRIVER, I had a 308 built years ago on a mauser action with a A+B barrel that was a .75" MOA rifle for the first 100-200 rounds but Im seeing the accuracy already starting to go. The barrel is a 1-10 twist and Im shooting 165BTs and 168VLDs and cant get it under 1.25 now unless I run lower end powder charges then it tightens up but velocity goes out the window. FWIW do you think I should rebarrel or do I have other options before that.
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  #12  
Old 06-05-2012, 08:13 PM
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Re: 280AI barrel questions

First thing I would do is clean the bore, I mean REALLY clean the bore. This is not a flame toward you. I have many rifles come in every year that are supposedly clean but after a week in the shop and getting several pennies worth of copper out of the bore, they really start to shoot again.

I do not recommend the use of Sweets 7.62 or Barnes CR-10 all the time but if you have a rifle such as a 308 where accuracy goes south I do soak the bore with these solvents to make sure the bore is clean. Repeat using them until the push out of the muzzle as clear and clean as they went into the bore.

In a barrel like this, its not uncommon to see a copper build up just ahead of the throat. This is what can cause accuracy to drop off as the bullets are swaged down in this tighter area of bore but then when the bullet passes this area, the bullets fit to the bore is loose and accuracy drops off because there is not enough pressure in the bore to bump up the bullets base to fill the bore again.

I would also recommend scoping the bore just to make sure its totally clean. If the accuracy does not come back, they you may want to have the muzzle recrowned, its cheap and can make a HUGE difference in accuracy is there has been any crown damage, even slight crown damage will destroy accuracy. Often it does not even need to be bad enough to see and still it can cut your accuracy.

I recommend this again because its cheap, should be less then $25-$30 to recrown your muzzle by most smiths.

If that does not bring the accuracy back, then yes it may be time to rebarrel.

Another thing to look at is if the bolt lugs are contacting the receiver evenly. That usually shows up as vertical stringing as pressures increase but as your barrel was shooting well at first but then went south, that probably is not the problem.

A 308 should get you 2000 rounds of accuracy life pretty easily, if it was shooting well before 200 rounds and went south after that, I would say there is something else going on other then a bad bore, that is unless you shot the first 100 rounds all at once as fast as you could!!!
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #13  
Old 06-05-2012, 08:57 PM
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Re: 280AI barrel questions

Quote:
Originally Posted by Fiftydriver View Post
First thing I would do is clean the bore, I mean REALLY clean the bore. This is not a flame toward you. I have many rifles come in every year that are supposedly clean but after a week in the shop and getting several pennies worth of copper out of the bore, they really start to shoot again.

I do not recommend the use of Sweets 7.62 or Barnes CR-10 all the time but if you have a rifle such as a 308 where accuracy goes south I do soak the bore with these solvents to make sure the bore is clean. Repeat using them until the push out of the muzzle as clear and clean as they went into the bore.

In a barrel like this, its not uncommon to see a copper build up just ahead of the throat. This is what can cause accuracy to drop off as the bullets are swaged down in this tighter area of bore but then when the bullet passes this area, the bullets fit to the bore is loose and accuracy drops off because there is not enough pressure in the bore to bump up the bullets base to fill the bore again.

I would also recommend scoping the bore just to make sure its totally clean. If the accuracy does not come back, they you may want to have the muzzle recrowned, its cheap and can make a HUGE difference in accuracy is there has been any crown damage, even slight crown damage will destroy accuracy. Often it does not even need to be bad enough to see and still it can cut your accuracy.

I recommend this again because its cheap, should be less then $25-$30 to recrown your muzzle by most smiths.

If that does not bring the accuracy back, then yes it may be time to rebarrel.

Another thing to look at is if the bolt lugs are contacting the receiver evenly. That usually shows up as vertical stringing as pressures increase but as your barrel was shooting well at first but then went south, that probably is not the problem.

A 308 should get you 2000 rounds of accuracy life pretty easily, if it was shooting well before 200 rounds and went south after that, I would say there is something else going on other then a bad bore, that is unless you shot the first 100 rounds all at once as fast as you could!!!
This helps alot I use barnes cr-10 on all my rifles as well as hoppes when I want to soak them overnight, but I know the barrel is clean I clean the bore every 15-20 shots or less if Im doing load workups. I do 3 wet patches 3 dry patches then a brush and start over and if its super dirty Ill let it soak for the 15 min like the bottle says.

Since you mentioned it I do feel a little rough spot about 1/3 to 1/2 way down the bore from the chamber, Ive thaught about running some TUBBS bullets through it and see if that helps but the barrel has had it this spot since day 1.

Im right on line with you about the crown I also thaught about cutting it to 20" and have it crowned.

Not seeing the vertical stringing yet so i dont think its the lugs just a bigger circle with my grouping, going from the .75 to over 1" at a hundred Im afraid to even shoot it at 200 or over after my last session with it over 8" group at 300.

Thanks for the info Ill give it all a try and if not Im putting a 20" shilen on this one as well.
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  #14  
Old 06-05-2012, 09:09 PM
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Re: 280AI barrel questions

If your using CR-10 for cleaning every 20 shots or so you may have etched your bore which can cause accuracy problems as well. CR-10 and Sweets 7,62 is way to aggressive for regular use so that may be an issue.

This is not opinion, I have had two personal rifles early in my shooting career that I used these products on that had the bores etched by them.

That may well be your problem.

If the bore is rough ahead of the throat you may want to have it lapped as well, that will smooth things up.
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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