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Old October 14, 2012, 08:51 AM   #11
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Join Date: September 12, 2008
Location: Chicago
Posts: 826
This is the nugget from the source above that will be most helpful in understanding what I mean:

"What's happening here is that the steel Wolf cases aren't expanding enough to form a good seal when fired, so some of the (dirty, carbon-filled) gasses are getting between the case and the chamber, causing a build up of carbon in the chamber that is far in excess of normal. Then, firing a brass case that DOES expand fully will result in that case being "glued" into the chamber by the carbon buildup.

It actually looks to me like the SA brass is BRITTLE, not too soft. Soft brass will be deformed at the case rim where the extractor pulled through it, while hard, brittle brass will just have that section of the rim broken off.

Likely, neither ammo would be a problem on its own, but mixing them is clearly bad news.
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