Uneven Rifling Wear or Bad Chambering?

Uneven Rifling Wear or Bad Chambering?

This is a discussion on Uneven Rifling Wear or Bad Chambering? within the Gunsmithing forums, part of the Sniping Related category; Hey all, I recently purchased a used Savage 12 chambered in 260 Remington. I have taken it to the range several times in an effort ...

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    Junior Member Anhur's Avatar
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    Uneven Rifling Wear or Bad Chambering?

    Hey all, I recently purchased a used Savage 12 chambered in 260 Remington. I have taken it to the range several times in an effort to get it grouping up. It has however been resisting my best efforts to get groups under 0.750". I suspected that the barrel on this unknown rifle was possibly to blame so I purchased some Cerrosafe and did a chamber cast of the chamber and about an inch of the throat and bore. After looking at the cast I am seeing that it appears as though the rifling is uneven in relation to the end of the chamber. I did my best to measure this with my little caliper and came up with the following measurements.

    0.192"
    0.178"
    0.164"
    0.149"
    0.221"
    0.209"

    It seems at though the rifling was either not cut correctly, the rifling wore unevenly, or I messed up or am misinterpreting the chamber cast. I did clean the bore thoroughly before doing the cast, but maybe some tough carbon or copper is stuck there. Anyone ever see anything like this before?
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