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Here's a couple more things you can try with your spud guns...
1) - File the end of the barrel down so that the edges are sharp as knives... kinda like this: /| |\ - The filed edges will cut into the potato smoother making a more uniformly shaped projectile.
2) - Remove the small plastic button from the hairspray can. Drill a hole in your chamber about the same size as the button and epoxy it into the chamber so that the spray hole is inside the chamber and the hole that once connected with the can is open to the outside. Then by inverting the hairspray can you can inject the hairspray directly into the chamber without removing the lid! This prevents any loss of fuel durring recapping. Just becareful of how many and how large your holes are... I once nearly blew off my leg when a weakened chamber exploded on me.
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