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Old August 1, 2014, 07:27 PM   #26
CANNONMAN
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I kinda like the plastic idea. Has anyone tried melting a pot of PVC? I think the idea of making a mold, filling with re-enforced concrete and coating with PVC sounds quick, inexpensive and gives a lot of room to experiment with design.
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Old August 1, 2014, 08:52 PM   #27
zimmerstutzen
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When I was about ten years old, I got a Plastic toy army molding set for my Birthday. When I ran out of plastic pellets we just melted down bleach and detergent bottles that we cleaned well and cut up. There was a heated cylinder with a funnel bottom smaller than a Lee lead melting pot. There was a piston attached to an arbor press arrangement for forcing the melted plastic through the base. We could mold anything available as a metal mold for molding lead soldiers, etc. We had a lot of burned fingers, but it was fun. Similar industrial units are now available for sale on-line, but the cheapest are about $800.

It is far easier to melt detergent bottles than pvc.
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Old August 2, 2014, 03:28 PM   #28
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Hmm, low ignition temp plastic + the heat of a powder charge? It would be good for setting fire to brush piles as well. It would be an interesting effect after dark though.
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Old August 2, 2014, 04:13 PM   #29
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Hmmm...

I forgot to address the issue with respect to imparting a spin on the projectile.

A stabilizing spin on a projectile, not having studied this, is likely a function related to length, diameter, shape, and RPM. A little spin might not be stabilizing at all. In fact, it may destablize somewhat.

If you're shooting round shot, I wouldn't worry about it. If you're shooting round shot in a sabot, I still wouldn't worry about it. If you're shooting elongate sabots, then it would be something you'll just have to experiment with and see what you can do to make it spin and how effective it is.

You can impart spin by altering the aerodynamic shape of the sabot. You can probably impart spin by the shape of the bottom of the sabot. How much and how effective, I don't know how you could gauge. Well, how much I don't know...but how effective could be gauged by studying the impact marks in a target object to look for keyholing.
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