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Here's a bulged 40S&W case showing the "guppy belly"
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I don't consider your case to show the "guppy belly". They just show the normal case expansion for being fired in a barrel with a generous chamber. The bulge is way too far up the case from the head to be due to the unsupported chamber that can cause the guppy belly. My guess is they have the glock impression on the fired primers. Glocks are know for having generous chamber.