I have been eyeing a Custom .218 Mashburn Bee done on the Ruger Blackhawk by Reeder Custom Guns. I think it'd be a great varmint / predator revolver, maybe express sights or small red dot mounted on top depending on how and where you'd use it most.
Anyway, I would much rather shoot standard .218 Bee loads in a gun to fireform them to .218 Mashburn!! As apposed to trying to resize .25-20 brass to .218 Mashburn, then having to neck turn and trim them. To me fireforming is much more fun then resizing, neck turning, trimming, etc.
By the way what are you shooting this round from??
Del