I thought about the EZ Moon Clips, "Made from space age hydrocarbon polymers" for range shooting. The steel moon clips work most of the time, but sometimes the metal is slightly bent and the rounds don't line up.
Yep, I think I'll give them a try. But back to the headspacing question; do the EZ Moon Clips compress under fire so that the cartridge again headspaces on the case mouth? Then again, it probably wouldn't matter - it's going to headspace properly somewhere.