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The marks around the mouth are broken just as the lands and grooves are.
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No way can that be rifling of your barrel on the case mouth.
1. The datum of the bullet would not let the case be pushed that far up.
2. The throat of your chamber does not have rifling in it.
3. The bullet will be 0.01 or 0.02 larger than the barrel and any lines and groves will appear on the bullet and not the case. The straight lines on the indents of the mouth of the case are from crimps not rifling.
Jim