37MM Projectile Instructions

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We are not liable for the unsafe or unlawful use of the enclosed materials. You assume all risks in the use of the materials and understand that these materials may be unlawful to use in certain configurations in some local, state, or federal jurisdictions. You shall hold us harmless for any claims that might be alleged or proven to be caused or contributed to person or property by the use of the materials and further, hold us harmless from any and all costs, losses, or expenses in defense of such claim.


The diagram below is a suggested construction to make a “Wildlife Control Device”. You can vary the actual placement of the inside plugs for fuse duration, and modify the nose disc for other devices, such as a smoke signal or a flare cartridge.

 Step 1: Install a 1.25" inside plug using a 1" dowel rod or similar tool). The rod should be marked in increments, to insure plug consistency. The distance from the plug to the bottom of the projectile base determines the fuse burn time until it ignites the main charge. Glue the plug in with Elmer’s glue and set aside to dry.

 Step 2: Pour in the inert material. Slightly overfill to allow for settling. This material can be plaster of Paris, epoxy, body filler, or similar material. If you use plaster of Paris, you must let it dry thoroughly to avoid the fuse getting damp. To speed drying time of plaster, bake the projectile in an oven at 175 degrees for 6 hours. Do not use Durham’s water putty for the inert material see step 10).

 Step 3: Cut or scrape off the excess inert material flush with the bottom of the tube, and cut a groove for glue at the inside tube wall.

 Step 4: Glue on an end disk with the beveled edge out, using a hot glue gun. Use slow setting glue to allow more working time to center the disk on the tube. 

Step 5: Drill the fuse hole through the end disk and inert material. This hole should be slightly larger than the fuse diameter.

 Step 6: Install the fuse. It should stick out the bottom disk about 1/8", and into the main charge chamber about 1/4" to 3/8".

 Step 7: Using hot glue, glue around the fuse end that is sticking out of the bottom disk.

 Step 8: Put in the main charge of whatever composition you are using. Black powder works great!

NOTE: per ATF guidelines, a destructive device contains 1/4 ounce(7grams) or more of explosive; DO NOT EQUAL OR EXCEED THIS AMOUNT!!

 Step 9: Install the other 1.25" inside plug with the dowel and gently push down onto the main charge. Glue in place with hot glue or a non-water based adhesive.

 Step 10: Fill in the remaining area at the top of the tube with epoxy or Durham’s water putty, mixed to a putty consistency, not a pourable consistency. Do not use plaster of Paris, the excess moisture will seep through to the main charge and dampen it. Slightly under fill the top to allow room for the glue to hold the top end disk. Allow to dry thoroughly.

 Step 11: Glue on the top end disk with hot glue, beveled edge out.

 Step 12: After you have reloaded the propellant cartridge in the 37MM nylon case, place a small bead of hot glue inside the case mouth, and immediately seat the projectile to a depth of about 1/4", but no deeper or you can produce excess pressure. The tube can be marked with an ink pen from the bottom of the completed unit, not the tube only.


We are not liable for the unsafe or unlawful use of the enclosed materials. You assume all risks in the use of the materials and understand that these materials may be unlawful to use in certain configurations in some local, state, or federal jurisdictions. You shall hold us harmless for any claims that might be alleged or proven to be caused or contributed to person or property by the use of the materials and further, hold us harmless from any and all costs, losses, or expenses in defense of such claim.