Borescope of my 338 Edge crown after 500+ rounds

[338edge]

Wipeout Tactical works even better on carbon.

Thanks

 

[bushmotornv]

I am of the school of thought that carbon buildup is back, copper is good. I do not clean my barrels bare, ever. After every match (100-200) I run 1 patch wet with Hoppes #9 and a few dry patches just to remove dust and keep the carbon down. I use a bore guide and nylon brush with a cotton patch wrapped around it. I never let the cleaning rod run on the crown.

I think a lot of people wear out their barrels with too much scrubbing. Abrasives are bad. Running cleaning rods across the crown will cause uneven wear of the crown. A bit of abrasive to smooth fire-cracking once in a blue moon is about all that is necessary.

Carbon rings in the throat are extremely detrimental to accuracy and pressure. You are basically squeezing the bullet smaller to pass through the carbon ring making the bullet sloppier in the bore. Gas blow by is also increased. Carbon buildup in muzzle breaks is also extremely detrimental to accuracy.

Both are easy fixes with patience. I run a wet patch of carbon remover past the carbon ring and leave wet over night. If very stubborn, I leave the wet patch in the bore on the ring ahead of the chamber for a while. Trying to speed up the process with mechanical means is not a method without a lot of risk.

just my 2 cents.

Correct me if I'm wrong,but a carbon ring in the "neck" area of the chamber would have to be around .015" thick,or as thick as the neck of your cartridge case,to cause bullet sizing upon firing. I just dont see that in the video of the chamber.

 

[WiscGunner]

Correct me if I'm wrong,but a carbon ring in the "neck" area of the chamber would have to be around .015" thick,or as thick as the neck of your cartridge case,to cause bullet sizing upon firing. I just dont see that in the video of the chamber.

Carbon buildup in the neck area of the chamber takes up the space for the brass to expand and can cause increased pressure.

Carbon buildup in the throat can present as a donut or ring that shrinks the diameter of the bore. This is in front front the chamber, not in the chamber.

Carbon in a muzzle device builds up a similar manner and slowly "shrink" the bore diameter until the bullets are brushing carbon on exit causing eratic fliers.

 

[Mram10us]

Is it a cut rifled barrel or button rifled

I think brux is button. shouldnt make a difference with this many rounds though, right?

 

[Mram10us]

I just got done cleaning the carbon and copper out of a 1950's Model 70 338 Win Mag. my go to carbon cleaner is Bore Tech C-4, my go to copper cleaner is wipe out-- patch out, then again, I have such good results with Montana and Hoppe's, nothing does it better than Wipe out products. this means the "accelerator" before patch out on nylon brushes and soak the bore in the two products together. then if it is really bad, like the 1950's M-70, I use a really unusual combination I discovered by complete accident.
I first put down accelerator, then patch out, after 20 minutes I start in with J&B Bore Paste and keep agitating until the patch out is a gel. then run a patch through and start all over again. nearly 70 years of copper and carbon build up came out in a couple of days between repairs on other guns. the gun was supposed to be a 1/2 MOA gun and has degraded to 1.5" gun last week. they wanted a new barrel and I asked if I could try to save the barrel.. I did, the gun now shoots 1/2" groups for me at 100 yards, that is not C to C that is edge to edge. 200 yards it is 3/8" C to C, 300 yards it is 1/2" C to C. this is one hell of a nice 338 Win Mag. I am going to offer to buy the gun when the guy comes to pick it up today.

Love to see a borescope of that. I am a visual guy and a lot of people say it cleans them to "bare metal" but I have never seen a bare metal cleaning since I got a borescope

 

[FURMAN]

Brux are cut.

 

[Mram10us]

Brux are cut.

Thanks. Couldnt remember without google. I always think the B barrels (bartlein, brux, etc) were button and they arent.

 

[FURMAN]

Bartlien are cut as well.

 

[Stscott86]

Guys that was one of the best post I've seen. I constantly look but your info was spot on!!Somethings I ignore because doesn't pertain to long range but I'm in the process of turning my 300 ultra into a edge and just good knowledge

 

[Stscott86]

I'm going to send mine to accurate ordnance to do it. They built a custom 6mm cr for my long range coyote and it flat out shoots!

 

[Mram10us]

Bartlien are cut as well.

Yes they are

 

[CA48]

I pulled my 338 EDGE AI, Brux 29" barrel at just under 2500rounds. The first half of the barrel was shot with a mild load at 2700fps with 300gr bullets and h1000 most of the second half was shot at 2800fps and probably around 100 rounds mixed in there with my N570 load at 2980fps. Up until 2400rds it would consistently shoot 3-4" 3 shot groups at 1000yards and in really good conditions even better. After 2400rds it would still shoot 5" 3 shot groups at 1000yards. At 2450rounds I shot a handful of 5 shot groups at 1200 yards and it still held right around half MOA in 4-5mph winds. After that I took it to 100yards shot a few 3 shot groups, they were around 5". I shot it on a few more outings then had the barrel pulled. Mostly never shot more than 3 before letting it cool, occasionally 5. This was with a bi-pod and rear bag.

Cleaning was what most would consider minimal. When I stopped seeing heavy signs on patch I would run a few more then call it good. I never tried to get the last bit of carbon or copper out. Just used non chlorinated brake clean and bore tech eliminator and would run a nylon brush and let the barrel soak at least 20-30min, never used any bore paste and cleaned every 40-50 rounds.

I've recently gone back to to bronze brushes I think they definitely get more carbon and copper out. Whether it's necessary to get that much out I'm not sure but don't think so. Also use bore tech carbon cleaner now vs brake cleaner. It would be interesting to look down that barrel now with a bore scope.

 

[PBR driver]

Unfortunately fouling and erosion is all part of the game.
There is no free lunch so to speak.
Be careful as more BBL's are ruined by improper cleaning and over cleaning than by use or neglect.
How does it shoot?
You are showing copper fouling, there may be imperfections the fouling is filling in, when you remove to much then it will fill back in as Bullets squeeze down the BBL.
Bores to erode at the throat and the muzzle especially on a high performance round like the Edge and my 7mm STW.
You probably know this but the heavier Bullets use less powder and may cause a bit less erosion.
Enjoy your rifle , hope you get a recipe that will perform and give you longer BBL life!

 

[Mram10us]

I know my cleaning practices have left plenty of copper in there and some carbon. Sounds like the copper isn't much of an issue compared to carbon according to a lot of you guys here and my gunsmith buddy. I'll fiddle with a fully cleaned barrel and one that is the norm for me. It's always shot really well at lr with simple cleaning till now