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Marks on spent shells?

1237 Views 6 Replies 4 Participants Last post by  joshuades
I'm new to this forum. I took my 6.8 out for the first time yesterday and noticed some marks on all of the spent casings. They are vertical lines about 5/32 apart on the neck. Can anyone tell me if there is something amiss? Is this normal?

Here is URL for my photo; https://flic.kr/p/3780144010
Thanks guys for all your help. I kinda suspected the barrel extension but now I am comforted by all your experienced advice and knowledge.


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I can't see the picture (pending approval), but is it safe to assume they are a pair of scratches that are parallel to each other from about the shoulder to the case mouth?
What Constructor said looks right from the pictures. I figured the same, and the advice he gave will adress the problem. The lug corners will wear down on their own given time, but if you're like me, impatience will win.
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