I have also had a number of dealings with George Fisher. He is a nice guy who ran a plastic molding operation (a one man operation as I understand). I believe he got some requests for inert ammo for the stage and wound up making his movie replica cartridges. He listed these seperately and as far as I know, these all have brown or gray or black bullets that look a bit like GM or lead or CN and some of these have color tips. I have/had quite a selection of these going up to .50 BMG including some interesting tip colors.
He also began making bullets in all colors of plastic just to show his range of stuff, and that is when I think the Collectors found him.
He would make anything you wanted. He even made plastic replica hand grenades that were hollow for a Zombie movie. The idea was to dump the chemicals from a light stick into them so they glowed in the dark. he did some similar stuff for other movies
Some people contacted him with other ideas and he did lots of work on .45-.50 plastic bullets with lead or copper or steel shot in the tip. He was doing this kind of development on his own nickel to get something the customer wanted, and he got stiffed by a number of his customers and just got out of the business about a year or so ago.
About that time he called me and offered me all his left over junk, and I bought it. Turns out it was a fair size box totally filled with bullets, etc including 5 of his prototype grenades for the Zombie movie. I passed on the last of these at the recent ECRA meeting in Holland as well as most of the bullets which I sold by the plastic bag full. I think I have made my money back, and have a few bullets left. About 25% are the brown/gray/black and the rest are a rainbow of colors. Below is a random handful.