rough bore


April 16, 2003, 02:14 PM
I finally had some time to shoot my new Lyman Great Plains Rifle. During my first cleaning session, afterwards, I ran a bore light into the barrel, and noticed quite a bit of roughness in the grooves. There seems to be roughness in the form of shallow pits and scale like "smear marks" in the grooves. These tend to be about 1-2" long, and are primarily within 3" of the bore. They only occur on some of the grooves, while others are perfectly smooth. Normally I would attribute this to lead fouling, however I shot this rifle with patched roundball only, and when I probed the smearing with a touchhole pick, it wouldn't scrape away. It almost looks as if their was some flaw in the steel when they drilled and then rifled it. It bears a ressemblence to the pictures of shot out barrel throats that I have seen in borescope photos, but this is on a much larger scale. So, should I call their service department about this and complain, or is this something that everyone sees in their bore?

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4v50 Gary
April 16, 2003, 05:16 PM
Call Customer Service and they'll probably swap barrels.

Generally I wouldn't worry if the bore shot true, but pits in a black powder means more crevices for more fouling and that's conducive to more rust.

April 17, 2003, 02:08 PM
Hmmm...the filter edited the word "s*c*r*a*p*e" out?

Anyway, here is an attachment pic with detail of the roughness in the bore.

Gerald McDonald
April 17, 2003, 05:48 PM
Looks like its galled to me. Probably from the rifling button or bore drill being run thru at an incorrect feed rate. (thats a guess) Probably wont affect the accuracy but might make it harder to clean.

April 28, 2003, 10:43 PM
My rifle has a rough spot, probably from corrosion. Anyway, is there some way I can lap it out?

May 19, 2003, 06:07 PM
Well, about 2 weeks after sending in the old rough bored barrel,
Lyman has shipped me a brand new barrel with a good smooth set of grooves!
Just wanted to mention that they'd corrected their problem....

4v50 Gary
May 19, 2003, 11:11 PM
Yikes! That picture was frightening. Glad to hear Lyman did you right.

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