Peter Cottontail wrote:wow, im amazed to be the first to say it but, ICE. Cut a piece of the same size pipe, tape over one end, fill with water, freeze, use running hot water to remove from tube, put in cooler, bring out to a safe fireing spot, load, and put a hole in a tree (and the ammo magically dissapears in a matter of minutes soo no clean-up afterward.
Ice slugs do work well. Let me rephrase/add on to your instructions, if I may:
Cut a piece of pipe the same size as your barrel, 3-4" long.
Seal off one end with a temporary cap (hardware store) or duct tape, etc... but make it reasonably watertight.
If you grease the inside of the pipe with cooking spray, WD40, etc... before you fill it, the ice slugs will come out of the mold much easier.
Fill it up 3/4 of the way with water, and put it in the freezer, upright, for a few hours (til it's solid).
If you grease the molds first, the slugs should come out reasonably easily, just let them thaw for about 10 minutes first and they should slide right out. If not, as Peter said, run some warm water over them for a few seconds.
If they melt too much, you'll need a bit of wadding behind it in the barrel, but no big deal.
This method also works with bondo and pycrete. Pycrete makes AWESOME, cheap ammo, just takes a bit of work....
Peace,
Pete Zaria.