Ammo size help

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WonkoTheSane

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I know there are a good number of knowledgeable gun folks in here, so maybe somebody can help me out.

I'm making a leather ammo-holder cuff as a gift for a friend in the US. I know he uses mostly S&W .40 ammo so the loops that retain it need to be sized appropriately. I think I've got it figured out but could use some confirmation.

Is the diameter of the case approximately 11mm? Could somebody with the right ammo and a micrometer confirm? I can't get hold of any in the UK of course and I work best in metric.

Many thanks.

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Parent case is 10mm auto. Case neck diameter is 10.7mm, case base diameter is 10.8mm and if it helps, case length is 21.6mm with a cartridge overall length of 28.8mm.
 
Parent case is 10mm auto. Case neck diameter is 10.7mm, case base diameter is 10.8mm and if it helps, case length is 21.6mm with an cartridge overall length of 28.8mm.
That's brilliant, thanks. What does the parent case refer to?

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40 cal case is a shortened 10mm case. A sibling of sorts.
 
Thanks again.

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