Instructables
So, I got a Cold Steel Big Bore blowgun a while back, and can't shoot it hard, because the darts are too loose in the barrel. Well, I've come up with an easy solution, make my own darts. After looking on instructables for a while, I realized that all of the paper coned darts suffered the same problem unless you made them exactly perfect (if I missed something, let me know). This motivated me to make my own darts, and think of a way to make them fit snugly, while being able to tolerate being too big., thus enabling me to fire them much stronger.

DISCLAIMER: I am not responsible for anything you do with this information, or with anything you make using this information. For educational purposes only.
 
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Step 2: Making the Cone, the Cone I Say!

Okay, so, take your piece of paper, and fold it like shown in the picture, start from the corner, and twist, make it as long as possible while having the little hole in front just smaller than the nail. Then, tape the cone shut.

Step 3: Trimming the Cone

Once you've made your cone, start cutting a small slot into the cone and shorten it from there. Fit it into the blowgun and if it doesn't fit keep trimming. Then stop! The cone has to be like a little too big for the hole. This is because we will modify it to fit perfectly while it is too big. Proceed to next step.
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Great idea, mate! The only thing I see that could go wrong with it is the epoxy possibly being too heavy. If its too large, sand it, and too small, add more, right?
I haven't worked with too many epoxy brands, but from the few I do know, they don't grip surfaces (that they aren't glued to) very well. perhaps some painters tape along the edge to provide grip to the barrel?
huhh....i never thought about the weight factor. i guess with a long enough tube it may not be a problem. i know in the .60 cal big-bore blowgun from cold steel they use solid darts....but youre dealing with a larger surface aria for the air to press against. idk, it was a thought. just something tht'd have to be played with to find out if it really works or not