Sorry Yondering. Couple guys from my club tried reloading the .358 bullets and they stuck in the throat. Wouldn’t load. 2 of them casted the chamber and they said needed.355’s. .357 wouldn’t fit. I don’t have one. Was in the middle of waiting for my 357 Rimless barrels when they announced.
Yes, the spec is for .355" throats, but the chamber is big enough to load .358", at least with the Winchester and Starline brass I have. (and yeah, the factory Winchester brass sucks)
IMO it was stupid to design a cartridge for bullets that didn't exist, especially when the entire point of the round was for straight wall states that specified .357" or larger. That was bureaucratic arrogance on Winchester's part, and the whole thing is a comedy of errors designed by a committee. They did everything wrong they possibly could have with the cartridge design. This coming from a guy who likes 35 cal rifles.
