I'm very new at reloading 9mm and want a Hornady BP collet. Of course bullet dia. .355 but noticed in Cabela's, they offer a collet for .322 & .358. Which will work for 9mm?
The .358 collet will work properly on any bullet in that size range (i.e. 9mm, .357, .38 pistol and .35 or 9mm rifle). The .322 collet would fit bullets for ctgs such as .32 Win. Spl. or 8mm rifle.
Hope this helps.