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Old January 12, 2019, 06:57 AM   #9
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Join Date: March 2, 2014
Posts: 5,650
Here is a close-up of one of the five cartridges that chambered with no issues:

and one of the 15 cartridges that would not get the bolt to close on it when fed directly into the chamber by hand:

I could not find any substantial differences between the two in terms of cartridge dimensions--but what I eventually figured out was that the the radiused edge from the rim side to face had a slight bevel on the cartridges that would work that wasn't as much of a "right angle" transition that the cases that wouldn't slip easily over the extractor have. If I took one of the "problem" cartridges and beveled the edge between the rim face and outer edge; the bolt closing problem vanished when doing a straight-in single-feed. Here is one of the "problem" cartridges that I beveled down the rim edge--you can see it as the brighter brass region:

Functionally, I'm not sure what that slight lip in the extractor is there for.
Attached Images
File Type: jpg stockWorks.jpg (114.3 KB, 222 views)
File Type: jpg stockNoGo.jpg (96.8 KB, 219 views)
File Type: jpg stock-shaved.jpg (100.4 KB, 224 views)
I screw things up--so you don't have to.
I am NOT an expert--I do not have any formal experience or certification in firearms use or testing; use any information I post at your own risk!

Last edited by stagpanther; January 12, 2019 at 08:22 AM.
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