Barrel "rings"

[theallcineyes]

I think it is a tool mark. i.e. Something that a higher end manufacturing organization wouldn't do, but something that shouldn't harm the gun overall.

 

[Bc'z]

As far as my screen name, no one liked it so I had it changed. Hope it's better.[/QUOTE]

Ahhhhhh must be the infamous
Carlos Hathcock
I still say iffn it was in the barrel it would NOT be on top of the skid marks in the corner of the grooves.
Now I know why people say don't use a bore scope, or in this case a endoscope.
You really need to listen to all the folks above and use an actual scope.
Or split this baby down the middle.

 

[ridgeway]

Set that endoscope out about 100 yards and shoot it with the barrel in question. Problem solved and no more ring. After that, save up for a Hawkeye and look at the inside with your own eye!

 

[J F Johannes]

It is optical rings from the outside light source being picked up by the camera, not the light on the endoscope

 

[Enosiophobia]

It is optical rings from the outside light source being picked up by the camera, not the light on the endoscope

I moved both the camera and the outside light source simultaneously. Rings didn"t move.

 

[J F Johannes]

I moved both the camera and the outside light source simultaneously. Rings didn"t move.

Try shutting the outside source off entirely, IDK

Jim

 

[Enosiophobia]

I've done it every which way I can, except no light.

 

[dolek]

Can you feel those "rings" ?

 

[2506]

I have seen barrels that have been ringed by people leaving oil in the bore and shooting them. The bullet will push the oil until it overtakes the oil and it causes a hydrostatic ring in the bore. Usually they shoot like crap after this though.

 

[Enosiophobia]

Can you feel those "rings" ?

Can't fit my fingers in there. All kidding aside, no.

 

[FrankG]

I'm not an expert on making barrels but I beieve the procedure is as follows.
1. The barrel blank is drilled.
2. The drilled hole is reamed.
3. If it's cut rifling a cutting tool is pulled thru the bore while it's rotated. I assume it cuts both land and grooves. This cutting would remove any reamer marks.
4. Next the barrel is lapped with an abrasive by pulling the lapping compound back and forth in the bore. No rotation. All scratches straight down thee barrel.

Your kinda close.....Depends on the maker and how the barrel is made.

After reaming we prelap/hone the bore getting it ready for rifling. This removes most if not all the bore reamer marks.

Single point cut rifling only cuts the grooves. It doesn’t touch the tops of the lands (bore)

After rifling it gets finished lapped.

 

[FrankG]

Reamer marks shouldn't be a perfect single circle on top of a land and adjacent groove. Cutting grooves removes material. If it was reamer marks why would it be a perfect straight line circle. A reamer and drill are pushed forward as they cut, they don't cut in a perfect circle. I examined machability tool marks on a microscope at a research center Machinability Lab. The marks are too perfect to be from a reamer or drill bit cutting as it moves forward. Why isn't there other marks nearby? Because it's a light reflection. The OP should get a piece of steel tubing from a hobby shop and see what a smooth suface looks llike.

Disagree....the reamer will leave marks basically in a line straight across. Like nice rings. When a barrel gets button rifled for example and the reamer marks are heavy and the barrel doesn’t get finished lapped in anyway the button rifling doesn’t remove or should I say not remove the marks all the way. You can see the mark on top of the land will line up perfectly with the left over mark in the groove.

A drill is pushed. Typically the drill will be around .007” - .010” under bore ream size.

The bore reamer is pulled not pushed. If you try and push a bore reamer it will want to cut to a different size then what it is suppose to. So the reamer is pulled and follows the bore. The reamer will leave a better finish than what the drill gave you and typically we ream to about .0003”-.0004” under bore finish size.

Yes it could be a simple light reflection.

 

[FrankG]

I'm betting Frank hit it, drill Mark's that the bore reamer never completely removed.

It’s possible but I’ll say not likely. If this did happen then the drill was drilling a hole to big and the bore reamer wasn’t cleaning the bore up but it will look different from a rough bore ream finish. Hard to describe but it will look like little chunks or pot marks are in the bore after reaming.

 

[Enosiophobia]

Aren't RPR barrels hammered?

 

[dolek]

Can't fit my fingers in there. All kidding aside, no.

Must be your imagination then Carlos.

 

[ebb]

Get a look at the barrel with a real borescope, the scope you have is most likely the cause of the ring.

 

[butchlambert]

My apologies for the range buddy pic. I forgot to change the settings. It was at 250 yards so correction is .38 MOA. 1 on the left, 4 on the right.

Here's some pics with a light source in the chamber and the camera light on. I can tell you with total certainty that when I move the camera, the rings do not move. If it was optical, it would change location / position with the light source yes?

View attachment 1106376 View attachment 1106377
I know these are still pics but when I move the camera in and out, they do not move.

As far as my screen name, no one liked it so I had it changed. Hope it's better.

Just jerking your chain.

 

[FrankG]

Aren't RPR barrels hammered?

Ruger factory barrels are both hammer forged and button rifled. What they do for which guns I don't know. I'm guessing the RPR barrels are hammer forged.

 

[Enosiophobia]

Ruger factory barrels are both hammer forged and button rifled. What they do for which guns I don't know. I'm guessing the RPR barrels are hammer forged.

I believe they are.

 

[Ned Ludd]

My guess is that it's the endoscope. If you're using what I think you are, they are designed to look forward, not to the sides. In the images you posted, the outside portion of the image from the ring backwards is blurry and distorted, with the ring itself being the clear line of demarcation being the ring itself. Everything in front of the ring is sharper and more focused, as would be expected from a lens designed to focus straight forward.