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Old April 14, 2010, 08:45 PM   #8
Senior Member
Join Date: August 25, 2008
Location: 1B ID
Posts: 10,705
I think it's extractor snap-over.

However, ADIDAS69 makes a good point:
If the case neck isn't machined parallel to the head and secondarily that inaccuracy makes the case too long at that point
It IS Winchester brass. I have not seen a straight case mouth on Winchester brass in about 10 years. Everything is under trim-to length on one side, and over max length on the other (high side versus low side of the crooked mouth).

Check your case length, and squareness of the mouth.
Don't even try it. It's even worse than the internet would lead you to believe.
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