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The 40mm practice rounds for the M203 simply used a .38 blank cartridge which can be pushed out after firing and a new one inserted and it is ready to go again. The blue capped rounds have an orange powder in the cap and when it impacts the cap braks open and the powder allows you to see where it hit. The problem is reusing the blue pastic caps. They can be salvaged and reglued only so many times until they look like a miniature Tiffany lampshade. They are very safe to reload, no powder or explosive is used.
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