Call em. They do non-std chambers as well as stds (the 358 Win is a std.) Even though they don’t show a 358 Win, I’m sure they will chamber it on a 20” barrel with .675”-.700” finished muzzle. They sell their actions as well if that is all that suits you. I’m sure they would build a 350 Rem Mag as well or a 35-300WSM (35 Sambar). The short mags actually are well suited to their 3” SA w/.532” bolt face. Either way their actions are a solid platform.
