Don't know for sure, but have a hunch that a 100W CO2 laser engraver could make short work of bullet trays and loading blocks. I was gonna buy one years ago but faltered at the cost.
Could I please bump this? I am actually looking to purchase some but this thread is about the closest that I can find.
My wife does laser work if anyone is interested.
Deer Park Laser
713-569-1110
Back when I was looking for these, I think I figured out that no one was making them for sale due to the labor involved. Most who have made them only made one or two sets for themselves and maybe a close friend. A CNC mill should help a bunch if one wanted to make them.
Joe