What type of powder should be used in a 9mm blank load. Have seen some using black powder and others using unknown (not pistol) powder. Any help on this appreciated.
Basically any powder will go bang if restricted. My first reloading business assignment as a teen was making blanks for Cadet Corps summer battles. I pulled the bullets of 30-06 ammo and stuffed in some cotton.
Military blanks for funerals have a cardboard plug in the case mouth with a heavy crimp over it and varnish to seal the case mouth.
30-06 blanks are currently hard to come by so I have suggested that a steel punch of the right diameter be purchased and some veterans could punch out the needed circles of cardboard for the making of the blanks.
45acp GI blanks have an extended case with a heavy star crimp and the extended case allows feeding of the round in an automatic weapon.
700X would be the least expensive powder and best bang for the buck with a target load and I would not want to use blackpowder by someone that is not an experienced blackpowder shooter as special precautions need to be taken to not allow a spark near the powder during loading.
I would try about 3 grains of 700X with cotton filling or if you used a depurring tool to sharpen the inside or outside of the case mouth you might be able to cut out some plugs from sheets of foam plastic that some electronics are packed in nowadays. Or stuff some plastic shopping bag material in the case, cut off with scissors and seal with a bit of silicone or spackle.
Watch where you point the weapon of course on firing.
700X has a high fast pressure curve so It will take less of it to go bang when restricted. Also the plugging materials might ignite so fire the blanks in a non flammable area.
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