Muzzle break burr?

[Berry228]

For all of you experts out there, am I seeing a burr in the muzzle break that may be shaving my bullets as they exit the barrel? I'm not sure if it's juse from all of the heat and pressure

 

[FearNoWind]

Whether or not its a "burr" I'd want to do some machine work on it if it were on my rifle. Wouldn't take long and it'd make me happier if it weren't there.

 

[J E Custom]

For all of you experts out there, am I seeing a burr in the muzzle break that may be shaving my bullets as they exit the barrel? I'm not sure if it's juse from all of the heat and pressure

If there is copper inside the brake, you have a problem of bullet strike.

The alignment on the brake bore is critical, and should have .010 of clearance on each side (.020 total) if the brake is bored correctly and the barrel threads are true to the bore. (I have seen this many times when the barrel treads are cut by means other than a lathe).

J E CUSTOM

 

[FearNoWind]

Berry ..... I'd recommend you find a gunsmith other than the guy who did this work and have him check out the brake/muzzle alignment. Even with a lathe it's possible to introduce threads that are not aligned with the center of the bore, not to mention that the same applies to threading the brake.
That's one reason why I prefer to cut the brake into the barrel itself.

 

[Berry228]

Here's a better picture after I cleaned out all of the carbon

 

[Hired Gun]

I doubt it's touching the bullets. When they touch it leaves a cleaner edge with rifling from the bullet cut into the edge.

How is the accuracy? If it is touching it should be easy to break that burr with a couple different means. A really small boring bar could be used to put a small chamfer and clean up that edge without opening up the clearance in the rest of the opening. That chamfer would help prevent the burr from reoccurring.

 

[J E Custom]

For all of you experts out there, am I seeing a burr in the muzzle break that may be shaving my bullets as they exit the barrel? I'm not sure if it's juse from all of the heat and pressure

looking at the pictures again It still looks like the last two bore holes have a copper buildup on them.

Copper wont just spray/cote its self on the inside of a brake unless there is a clearance problem. When a brake is misaligned, it will get worse as it gets near the exit hole and it looks like the last two holes are being coted. The bead of copper could be a build up of copper from the strike.

A properly installed and bored brake will/should have only a carbon build up on the inside, and it should actually be worse on the first port and get better towards the front of the brake. and the apparent gas cutting of the edges of the holes indicate a seal between the bullet and the hole. Once the copper is deposited, it will continue to build up just like it does in a barrel and can only get worse. This phenomenon is also not normal unless the brake material is very soft. (Proper alloys are much tougher/harder than the jacket material and can handle the copper and gasses that they have to deal with).

You are right to concern your self because it is not normal and needs to be fixed as recommended.

J E CUSTOM

 

[Triple BB]

I had some factory burrs on my break that my smith must've missed. I put a rod and patch down the barrel from the action and stopped, leaving it at the end of the barrel too plug it. I used a Dremel tool and carefully polished off the burrs. Pushed the rod on through and then ran some air down the barrel from the action as well as gave it a good cleaning afterwards. Worked perfect...