keep the ideas coming, but keep in mind:
-most people have never plinked at 75-100 yards until they get to an LCR gravel pit.
-effects that look cool at 20 yards with a .45 may barely be visible at 100 yards with a .223 e.g beer and soda cans, water bottles, probably lollipops as well.
-if you shoot 2L or 20oz soda bottles, remove the label and the ring--saves on a lot of cleanup. A flat head screwdriver is the prefered tool for this job---a perfect use for a worn out (i.e. used twice) Harbor Freight screwdriver
-bowling pins and empty propane tanks have performed consistently well
-if you can't get bowling pins, get an untreated 4x4 and cut it into 10"to 12" sections. It helps if you paint it white or yellow---works especially well for pistol
-bottles of ice are much better than bottles of water
-what was the verdict on the gong from LCR shoot#1. I think 30 caliber worked well but .223 didn't react well
- when all else fails.....tennis balls!!...3 for a buck at your local dollar store. Softballs worked well too. For night shoot, try the "soak tennis ball in lighter fluid and ignite" method