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Discussion Starter · #1 ·
I like to look at other people's brass sometimes when I go to the range, especially if I see something unique. Today I found a 9mm, it says "S&B" and extending from the open end, about halfway down to the primer end, there is a crack running. It goes all the way through as I can see light through most of it. Burn marks made by escaping gas run the length of it, so it wasn't made afterwards.

I know it's not mine, because I only use Wally World Winchester at the range, but I am curious about what would cause this, and would it have been a misfire or other failure that the shooter would have noticed?
 

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The round may have been reloaded before and the constant shooting, stretching, resizing, trimming etc etc could have weakened the brass enough to cause it to fail. On a recent brass gathering trip I found several Winchester .357Sig, Win .40S&W and some Starline cased .45ACP's in similar condition. Could have been oversized chambers in the guns the brass was shot in because the brass look almost brand new.
 
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Discussion Starter · #4 ·
I have seen cases cracked after 1 firing using factory ammo. A weakness in the metal. Cases will weaken and crack if reloaded too many times. The metal is fatigued from too many resizing operations. The shooter rarely will know if a case cracks from the case mouth down part way to the rear. The chamber will contain the esacping gasses and the shot will usually sound normal.
 
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