2.5" Concrete Balls
I have always wanted to shoot concrete balls or cans of concrete, but never really got a chance. There was a discussion on the spudtech forums, which lead to this information. It was really strange, because the same day that DR (from the forums) posted this how-to, A friend showed me about the light bulbs. What a very strange coincidence!
As you may know, regular light bulbs fit nearly perfectly in a 2.5" sch40 barrel (Tennis Ball Barrel). This method uses that to it's advantage, providing a cheap mold for making cement slugs. Think about how many burnt out light bulbs you throw away per year! You could even have your neighbors or friends save them for you!
It is a good idea to wear protective gloves while doing this, or at least wrap the light bulb in a towel (light bulbs are glass and broken glass can cut).
This info was provided by DR from the spudtech forums:
Thanks DR for the great how-to!
A few notes on how I did it: Instead of prying the metal up, I whacked it with the heavy end of a butter knife... the insulating resin part will crumble out.
Remember, you are not limited to cement! You could use plaster, sand, Bondo or any number of fillers. I used some Durham's Rock Hard Water Putty to fill a bulb, and it worked perfectly. Here are a few pics of some ammo I have made:
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