300 win mag barrel crack

[Scott Krolczyk]

I have a Remington 700 R5 Gen 2 300 win mag. I have around 400 rounds through it. I ran a bore scope in it today and found what looks like a crack all the way around the inside of the bore about 7" in from the muzzle.
Have any of you guys seen anything like this? what is it?

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[rijndael]

Twins! 700 5R, .308, and about the same distance from the muzzle.

My gun is amazingly accurate.

 

[338 dude]

I have a Remington 700 R5 Gen 2 300 win mag. I have around 400 rounds through it. View attachment 1247157View attachment 1247158 I ran a bore scope in it today and found what looks like a crack all the way around the inside of the bore about 7" in from the muzzle.
Have any of you guys seen anything like this? what is it?

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My guess would be drill Marks possibly some kind of machine Marks I doubt it is a crack but anything is possible

 

[Scott Krolczyk]

Twins! 700 5R, .308, and about the same distance from the muzzle.

My gun is amazingly accurate.

View attachment 1247159


View attachment 1247160

What??? No way??? That's crazy. Yeah mine is very accurate as well. great shooter!
I'm just hoping I'm not going to blow the end of my barrel off one day!

 

[Scott Krolczyk]

My last 3 round group at 100 yards...

 

[rijndael]

I was not concerned about mine having future issues, it was clearly not a crack.

 

[3Ackleys]

Looks like after they cut the blank twice, it was still too short. So they spliced in a piece!

 

[paperpuncher]

My last 3 round group at 100 yards...

Judging by that group somebody should figure out how to add the crack feature to barrels

 

[Scott Krolczyk]

Judging by that group somebody should figure out how to add the crack feature to barrels

Yeah right!!!! I’m more lucky than good but this rifle is sub MOA at 100 yards consistently! It’s a shooter for sure!!

 

[Scott Krolczyk]

I’m not very comfortable with that mark or crack or whatever it is in the bore. Don’t know if it was always there or not. Today was the first time I ever scoped the bore.
As long as the rifle holds good groups I guess it’s no big deal deal. Maybe I should have never scoped the bore!!!

 

[338 dude]

I’m not very comfortable with that mark or crack or whatever it is in the bore. Don’t know if it was always there or not. Today was the first time I ever scoped the bore.
As long as the rifle holds good groups I guess it’s no big deal deal. Maybe I should have never scoped the bore!!!

A borescope it’s just one piece of the puzzle it should be used to diagnose a problem if you do not have a problem don’t be too concerned about it let the target dictate if you have a problem in the first place

 

[Coyotefurharvester]

That's how the forensics lab will match the bullets to the firearm.

 

[Walt Krafft]

Ringing the barrel like a bell may indicate if a crack is present.

 

[3Sigma]

A true crack would be so small you need to magnaflux or xray to see it. One that big would have caused bigger problems by now.

Looks like machining marks from the rifling or drilling process. Or the hammer forging if that was used.

 

[YEW PLUCKER]

A true crack would be so small you need to magnaflux or xray to see it. One that big would have caused bigger problems by now.

Looks like machining marks from the rifling or drilling process. Or the hammer forging if that was used.

Aren't Remington barrels hammer forged? Maybe that was a flaw on the mandrel around which the blank was hammered to form the rifling? Just a thought.

 

[LHSmith]

Remington's version of GoodyearTires wear indicator- both you guys are still in the break-in stage.

 

[msalm]

Looks to me like the bore reamer picked up a chip and gouged out that groove, and it was deep enough the rifling process didn’t iron out the mark. It won’t hurt a thing.

 

[Ned Ludd]

This is one of those things that were it my rifle barrel I would likely wish I had not found it, mainly due to the psychological "trauma". LOL. The rifle obviously shoots. It's probably a machining mark of some sort rather than a crack. Unfortunately, you can't "unsee" it, now that you know it's there. I'd suggest a few things. First, just for safety's sake, inspect the exterior of the barrel very carefully in that exact region. You can estimate pretty closely where it is located using the shaft of the borescope as a sort of ruler. Assuming the inspection doesn't show anything irregular, try not to let it bother you mentally when shooting. Finally, I'd check that region of the bore regularly after cleaning to make sure the irregularity wasn't picking up any carbon/dirt/copper/patch fibers/etc. or causing excessive coppering closer to the muzzle.

 

[Scott Krolczyk]

This is one of those things that were it my rifle barrel I would likely wish I had not found it, mainly due to the psychological "trauma". LOL. The rifle obviously shoots. It's probably a machining mark of some sort rather than a crack. Unfortunately, you can't "unsee" it, now that you know it's there. I'd suggest a few things. First, just for safety's sake, inspect the exterior of the barrel very carefully in that exact region. You can estimate pretty closely where it is located using the shaft of the borescope as a sort of ruler. Assuming the inspection doesn't show anything irregular, try not to let it bother you mentally when shooting. Finally, I'd check that region of the bore regularly after cleaning to make sure the irregularity wasn't picking up any carbon/dirt/copper/patch fibers/etc. or causing excessive coppering closer to the muzzle.

I checked the outside of the barrel closely and found no indications of a defect.
Im not going to worry about it, Im just going to shoot it like nothing is there.

 

[Idaho-Lefty]

Lap / Polish that, scratch area's "Rifling" with, some JB's or ISSO "slathered" on a patch over, a Bronze Brush, for about, 15-20 "strokes", clean bbl thoroughly and like Ned Lund said,... "Forget about, it" !
The Bullet passes over that, Scratch, SO freakin' FAST that, it won't harm, the accuracy !
The polishing I noted above, is so that, it won't "Hold" too much, Copper in that area.