bad barrel?

[Richard Coody]

View attachment 1176803 View attachment 1176804 View attachment 1176806 View attachment 1176807 View attachment 1176808 200 or so rounds on this 12 twist 6BR barrel. not shooting worth a damn. check out the borescope pics of the throat area. the pics are all of one groove but the other grooves have similar but less severe marks. i thought it was just leftover reamer tool marks when i first looked at the barrel when un shot,, but this groove seems to be getting worse. in the larger pics direct from the borescope, the marks can be seen to be fairly deep. bad steel?

Is this a rebarrel on a rifle that has shot well In the past.or a new Rifle?

Rebarrel pretty well eliminates all those other issues that could be effecting your groups.

New rifle there is a myraid of things that could be causing your problems besides your barrel.

A new barrel could eliminate one. Looks like you are not happy with it anyway. Make a good tomato stake.

 

[Evan]

what's the record for a 5 shot group shot a 100 yards?

http://bulletin.accurateshooter.com/2013/09/best-group-ever-michael-stinnetts-0077-five-shot-group/

 

[swadiver]

http://bulletin.accurateshooter.com/2013/09/best-group-ever-michael-stinnetts-0077-five-shot-group/

thanks. damn! i think i am close!

 

[swadiver]

Is this a rebarrel on a rifle that has shot well In the past.or a new Rifle?

Rebarrel pretty well eliminates all those other issues that could be effecting your groups.

New rifle there is a myraid of things that could be causing your problems besides your barrel.

A new barrel could eliminate one. Looks like you are not happy with it anyway. Make a good tomato stake.

it's a new barrel on an existing rifle. all the components involved have shot well with other barrels.

 

[Stan Taylor]

I have read most of this post but you never did say how bad it shot as far as groups it would be nice to know what kind of groups you are getting.

 

[searcher]

Looking at the photos of the bore, it is hard to tell for sure by that photo - but I'm going to call those "cuts" in the grooves as fire-cracking - and not machine marks. I've never seen a Brux barrel (or most other custom quality barrels) come to the buyer with machine marks that bad - which are very common in lots of factory rifles (think Savage, Ruger, etc). So -if those are fire cracks and 200 rounds did that, you have gotten that barrel pretty toasty right out the gate. Add the carbon and copper in the bore - I'm kind of thinking time to slow the rate of fire and clean really good with JB - then work on a load. I have a number of barrels that shoot pretty darn good that make that barrel look like an unfired one - almost. The most detrimental problems affecting accuracy due to a barrel "wearing out" are a rough throat that tears on the bullet and/or lengthened throat due to fire-erosion. I can't believe that can be done in 200 rounds unless you were doing 50-shot strings rapid-fire.!!!

 

[shoot4fun]

As Brux barrels are a bit tighter internally than others maybe the reamer pilot bushing was a little too snug and caused some tool marks?
I own a borescope and I always inspect after cleaning. I look for clean and not anything else. You say those are in the throat cut I think they are just a bit ahead of there.
I have to go with @Stan Taylor on this one. You showed us a pic of a very nice (exceptional) group. Are you expecting the same from the barrel in question?

 

[swadiver]

As Brux barrels are a bit tighter internally than others maybe the reamer pilot bushing was a little too snug and caused some tool marks?
I own a borescope and I always inspect after cleaning. I look for clean and not anything else. You say those are in the throat cut I think they are just a bit ahead of there.
I have to go with @Stan Taylor on this one. You showed us a pic of a very nice (exceptional) group. Are you expecting the same from the barrel in question?

as to group size like the one pictured, not really expecting that at all. those kind of groups don't come often from any barrel. the issue with this barrel is the is no consistency at all. i can not find one combination that is repeatable. i will post a target pic to show what i mean

 

[coldboreshot]

thanks all. i have changed the following to try and isolate the problem to no avail so far.

1) different action
2) different scope rail
3) different scope rings
4) different scope
5) different stock.

all the components involved have shot well with other barrels.

How about the trigger?

 

[jim_k]

Have you checked the crown? I shot one with a bad crown recently, and it was 1.5" at best. After a clean crown, it was 0.375" for 5 shots.

 

[highplainsdrifter]

In the OP right under the pics it states 6BR.

No doubt about it! I gotta get a new set of glasses!!!
Thanks. Highplainsdrifter, Out!

 

[Dusty Stevens]

Brux has nothing to do with a dirty barrel. You need a bronze brush- youre just practicing with your cleaning regimen. It may not be the dirty barrel holding you back but you cant start troubleshooting until you can clean that barrel up. Youre going to need some jb/iosso to get it back into shape then keep it clean by using a bronze brush and a good solvent like butchs.

 

[Richard Coody]

it's a new barrel on an existing rifle. all the components involved have shot well with other barrels.

Well some barrels shoot better than others. It is the luck of the draw. But 6br's just shoot. I see nothing in your pics that look worse than some of the savage barrel pics posted on this forum and they shoot fine. You will never be happy with this barrel. Personally i would just chalk it up to experience and rebarrel.

You can send it back and see what they say. I would clean it up good first though.

 

[johara1]

thanks. damn! i think i am close!

Don't let it go to your head you are close. I have a 7 twist Kreiger that shot an .020 even with 110's and a 7.83 Brux that do the same and repeated with 110's also and a Lederer that flat shoots in the zeros with Barts 105. they are pulled off waiting for a World Open and Nationals if we ever get to shoot again. I had a few bad barrels and some that are average at best but they were all clean but one...... jim

 

[swadiver]

Brux has nothing to do with a dirty barrel. You need a bronze brush- youre just practicing with your cleaning regimen. It may not be the dirty barrel holding you back but you cant start troubleshooting until you can clean that barrel up. Youre going to need some jb/iosso to get it back into shape then keep it clean by using a bronze brush and a good solvent like butchs.

i use C4 for carbon, Wipeout on barrels not accumulating much copper and Sweet 7.62 for barrels with more copper, i have JB Borepaste and Flitz barrel cleaner as well. i normally use those at around 500 rd intervals. i don't as a rule use bronze brushes. i am going to JB this barrel prior to shooting it again. however, i got a bunch of other barrels of a lot of different calibers cleaned in the same way as is that are shooters.

i have had at least 15 6BR barrels from factory ones to prefits and customs. not one has ever shot like this when new or early it's life. i have two other Brux 6BR barrels. one is my original 12 twist. is a laser beam even after 1600 or so rounds through it. that's why i bought this problematic 12 twist from them. it was chambered by the same smith with the same reamer. the other is a new 8 twist for F Class. it also is an excellent shooter. i think Brux makes a fine product. i have .22 cal barrel of theirs waiting to be chambered in .222. i would buy another Brux again. maybe i just got one of the few bad ones. it happens. we will see what it does going forward

thanks for the help

 

[Stan Taylor]

I would really like to see some pics of the groups that this rifle is shooting.

 

[Longtrain]

just cleaned before the pic. soaked overnight with wipeout...

I don’t like Wipeout, didn’t work for me at all. Smells like oven cleaners. Don’t mean to make this a how to clean thread, but I would run several patches of Butch’s Bore Shine or you choice of carbon remover, using a good bronze brush and solvent scrub 20 strokes, patch out with solvent, repeat 2-3x’s. Then using a worn brush, wrap a patch around it and smear JB Bore Paste all over the patch. Short stroke the JB patch, working the throat area well, lengthing the stroke until it exits the barrel. Remove the patch/brush, withdraw the rod, screw the patch/brush back on, add more JB, repeat 5x, patch out black goo with lots of solvent and patches. Scope and repeat as needed.

Edit: A good barrel should look something like this after a quality cleaning.

 

[JEFFPPC]

I am curious why so much resistance to cleaning the barrel properly with bore pic to verify and then shooting some groups over a clean barrel. To this point this post is like throwing a hand full of ideas against the wall and see what sticks without doing the basics. If the loading or shooting process is a reflection of the cleaning then any good results are good luck not the results of a total process from proper cleaning through good loading technique to good shooting procedures.

 

[swadiver]

I would really like to see some pics of the groups that this rifle is shooting.

coming

 

[Longtrain]

I am curious why so much resistance to cleaning the barrel properly with bore pic to verify and then shooting some groups over a clean barrel...

+1 Bingo. I usually clean well after a two day match, which includes fouling, sighters and maybe some last minute test rounds up to about 200 rounds. Cleaning isn't a five minute job, it takes time and a lot of elbow grease. I may stretch it over a day or three.