I know....never look through a borescope, but....

[gme]

if the chamber reamer is not carefully withdrawn between pushes and is allowed to drag on the sides of the chamber it can leave fairly deep linear scratch marks similar to that

 

[jxb]

Now that it's cleaned up, look like scrapes not cracks. Put the 90 on it and move it in/out from the wall to get focus figured out but hint it will need to be close, just like in the bore. Cracks you can see down into, just like firecracks. You can drop a single clean patch thread in there for size comparison, but I can tell you from experience patch threads look huge, there's that much magnification.

 

[LVLAaron]

if the chamber reamer is not carefully withdrawn between pushes and is allowed to drag on the sides of the chamber it can leave fairly deep linear scratch marks similar to that

100% agree. That doesn't look like cracks at all. That's scratches. It's not pretty, but doesn't matter. I'd shoot it.

 

[MikeRu]

I will try that, but it will be MUCH easer after I remove the BBL. Makes me wish I had kept all of my grandpa's dentist tools....lots of different picks and stuff.

Autozone should have a nice set of pick tools under $50

 

[ggshoots]

As mentioned by GME and Aaron, looks like reamer scratches when the chamber was about done. Drag marks going in or out. If its leaving marks on cases from any rough edge just polish it out then shoot it. If you hired it done I guess you could see if they want to fix it. If you did it yourself, blame it on something else. Lol

 

[clowdis]

If you're going to take the barrel off, take it to a gunsmith and have him polish the chamber. He can do that without making it oversize and he may get the scratches out or at least reduce them to a point that you can determine whether they are indeed scratches or cracks. Hopefully just scratches.

 

[Webster]

I saw this in the chamber when looking for something else. Admittedly, I am a nu-by when it comes to borescoping.

Rem 700. 1.25 HV taper 30 inch 1-7 twist 6.5 prc. 273 rounds fired. 56.5 H1000 147 eldm @ 3070

Pics are without 90 degree lens.. Couldn't get the picture right with any of the 90 lenses. Doesn't seem right .

Normal?

Should I panic?

Thanks, Tod

Do you use a bore guide for the cleaning rod?

 

[338 Mollett]

Better pics. Could easily have been some chips drug across the surface .

 

[danny]

I am not expert on anything except for ground hogs.

But seriously, would the old paper clip check reveal if those are indeed cracks? It might be worth a try.

If they are indeed cracks, it's hard to imagine it could happen from just shooting. If they are cracks, I would suspect that they were material defects from the start.

I was a Level III in non-destructive testing. A liquid penetrate test which is relatively inexpensive, would quickly reveal if these are cracks but it may not be possible to use this test method due to the constrained area.

I would also suggest checking with a dental pick or sharpened paper clip to see if you "catch a crack".

Danny

 

[4xforfun]

Do you use a bore guide for the cleaning rod?

Yes.....I have a whole gaggle of the Sinclair "O" ring guides for all of my different actions and chambers. Must have 20 of them.