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Smiles?

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I keep reading about smiles. Would someone be so kind as to explain? Thanks in advance.
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You mean emojis?
 

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Ah.......also like the "smile" on the outside of the muzzle.
 

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8,238 Posts
Probably a misnomer. More like a frown. Usually means a little too much pressure causing the brass to expand down the feed ramp. The brass is really thin at the "smile" so not good to reload.

The next step on the pressure curve is a blowout. The smile is where the case will give way.
 
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