Barrel chamber scratches

[butchlambert]

I use my drill motor with a bronze brush in the throat for about 5 seconds after chambering. Mine ain't got those marks. I really don't see those marks in the photos as brush marks.

 

[Ggmac]

You all are much more polite than my reply would be , so I'm keeping my mouth shut .

 

[hogpatrol]

IF it was really the brush (it's not) the marks would be in the grooves too. Looks like an unfinished grind job on the reamer.

 

[Dusty Stevens]

I let Lucky Shooter borrow my brand new reamer. RPM he used was 70. Dark sulphur cutting fluid.

I have never seen this in one of my chambers...mind blower for sure.

Check your reamer under magnification. Like the hog patrol said above it could have been ruff from the start

 

[DaveTooley]

Yea 22-250 has very little room for chips in the flutes. Been there done that myself. In fact I broke a 22-250 reamer making a shoulder bump gage. Loaded it up with chips until it snapped.

 

[Lucky Shooter]

Many thanks for many ideas-----still puzzled here.

Well GGmac, no stranger to impolite here----cut'er loose baby or just sent me a PM.
Would love to hear what you think.

A. Weldy

 

[Stan Taylor]

Many thanks for many ideas-----still puzzled here.

Well GGmac, no stranger to impolite here----cut'er loose baby or just sent me a PM.
Would love to hear what you think.
I hope you didn't mind me putting your pics on here there is wealthof knowledge from the old timers.

A. Weldy

 

[Lucky Shooter]

No sweat on the pictures----thanks for helping me out.

A. Weldy

 

[powderbrake]

Is there any chance the bronze brush was made with core of twisted steel wire? The twisted wire at the front end of the brush could scratch the chamber.

 

[Dusty Stevens]

Is there any chance the bronze brush was made with core of twisted steel wire? The twisted wire at the front end of the brush could scratch the chamber.

Not those scratches. A tool did that

 

[Ccrider]

I think I have similar marks in my barrel. Never thought they were from a brush. Sort of thought they may be from firecracking or wear.

 

[Ccrider]

Here is a picture.

 

[Stan Taylor]

Here is a picture.
View attachment 1127692

Question what kind of barrel.

 

[Ccrider]

Question what kind of barrel.

Shilen 14 twist.

 

[Stan Taylor]

Shilen 14 twist.

If that's the case on the edge like it is I think they didn't get rid of the reamer marks when they lapped I wouldn't be overly concerned.

 

[kendog]

Never mind the throat in the bore scope, how does the target look??

 

[DaveTooley]

Is there any chance the bronze brush was made with core of twisted steel wire? The twisted wire at the front end of the brush could scratch the chamber.

This was done during chambering. All of us that do this for a living pay special attention to the surface finish on the lead angle in the throat. That area of the reamer is the single most important cutting surface on the entire reamer. Not all reamers will yield the same surface finish. I retire reamers as soon as I see that cutting edge breaking down. That can happen quickly depending on if and how you rough in a chamber. I go so far as to polish the throat in all the barrels I chamber.

 

[DaveTooley]

Here is a picture.
View attachment 1127692

How many rounds on that barrel? What's the location of the photo? What's the other end of the barrel look like? It's difficult to tell but it appears to be heat checking with copper in the cracks. I don't see any symmetry to the pattern and I don't think you could get as vivid a reflection from just tool marks in a used barrel.

 

[gunsandgunsmithing]

I've got a reamer like that. I just won a National Championship with the barrel it cut though! Do I like it...Nope! The barrel coppered a bit during break in but not since. I have since started running a throater in about .010 where that reamer gets used. It solved the problem but doesn't shoot any better or worse.

Look at the reamer flutes with your bore scope. Mine looks like a serrated steak knife!

I plan to send it back soon.

 

[spitfire_er]

Looks like a dull reamer with excessive chip loading. Cleaning the bore out with each pass, or just the chamber?