This are great for mini firearms, they are simple and easy to make.
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First you need
fuse (you can make or buy your own)
Acquire some .22 bullet shells, do no use live rounds.
Drill a hole next to the end of the bullet.
Place a fuse in the hole and sit it on its end.
For your lead shot use solder that has beed melted so its in a ball shape.
Now pour the powder into the shells and push it down with something, then drop a few lead shot in, then you take a bit of cotton roll it into a ball and push it into the top sealing the bullet off.
Thats it have fun fireing.