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12 Gauge Shotgun Shell Snap Cap Dummy Round Insert 3D Printer File Image 1
12 Gauge Shotgun Shell Snap Cap Dummy Round Insert 3D Printer File Image 2
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12 Gauge Shotgun Shell Snap Cap Dummy Round Insert

DeeTree85 avatarDeeTree85

July 17, 2025

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Description

12 Gauge Shotgun Shell Snap Cap Dummy Round Insert

 

For turning spent 12 gauge shotgun shells into snap caps / dummy rounds.

Simply punch out the primer from the inside out.
May have to drill/ream the primer pocket out - 6mm drill bit worked for me.
Push the inserts into the shotgun shell.
Fill the hollow tube with sand/gravel/etc to give it a little more weight.
Small amount of glue around the inner rim of the shell
Push the top insert into place - give it a light tap with a hammer to seat it home.

 

Works flawlessly in my Winchester Under/Over 12 gauge shotgun.

 

Enjoy!

License:

BY-SA

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