I don't post often, but thought I would offer this.
I have the Lyman Bore Cam. It is a good tool.
I bought a rifle last October for the BIL's retirement gift.
It set in the safe 'til after Christmas before I started working on it.
When I got some ammo loaded for development, I figured I would scope the bore just to see.
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As you can see the barrel has lots of chatter marks from breech to muzzle.
I took it out and shot 15 rounds and came home and scoped the barrel again.
There was one streak of copper 10" long on one side of the barrel. I know this because the camera rod is marked off as a ruler.
Also, part of the lands looked like a miniature mill file and it held copper quite well.
I sent the pictures to Savage, and they told me to send the rifle to them so I did. I haven't gotten it back yet, but they just received it yesterday.
Before I sent it back, I gave the barrel 2 treatments with Sharp ShootRs Wipeout with the Accelerator and all the copper was gone.
Draw your own conclusions as to the worth of a bore scope, but I am so glad I have mine.