Thanks for the info about the reamers and guages.. As to jigs, I wouldn't use one. I would set up between centers and install a steadyrest. Drive off the chuck using the bolt handle. I use a grinder to cut the face as the ejector fillet is really hard on carbide tools.. Although I've not done a wssm round.. I think if I were into a new 6mm round I'd try the 6mm-06 or perhaps a 240 Gibbs... Good luck with the new project.. If you have the means I'd really be interested in the performance you get with this round....