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Narrowing the throat of a large casing?

Persian Gulf Command

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Persian Gulf Command

Question to you ordnance guys? I have a 57mm and a 75mm casing I want to receive their appropriate AP projectiles. The throats of the casings are a bit too large, so I want to narrow the opening without deforming the circumference.  I've tried a hose clamp around a PVC collar but can't get enough pressure because the screw strips its band before narrowing the throat of the casing.


Any suggestions?  

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