In this video I explain what a 6.57PRCW cartridge is, and why I am currently developing it for Fclass. I hope this video explains a few things and can provide some clarity to viewers if they're thinking about going down this path. Enjoy and fire away with any questions.

UPDATE: A couple of minor corrections from my narrative:

The saami prc is .533 at the .200 line, so Alex Wheeler only increased it .002 as advised by Alex Wheeler.