As far as the 223WSSM, I built one as soon as the chamber dimensions were published. Had a lot of fun wringing it out, and I’ll agree with earlier posters that the 1/10 twist was one of the nails in the coffin. Another was the horrible accuracy of some factory guns when Winchester threw some leftover parts together, including barrels without the chrome lining.
As a reloader, the case presents some particular challenges, nail number three. The brass is so heavy and the neck so thick that consistent neck tension pretty much demands annealing.
Other than that, it goes bang and sends a 22 bullet down range pretty fast and plenty accurate. But there are simply better ways to do that.
