I understand that!
But if that is true (and I saw your SAAMI ref), why aren't ammo manufactures (and us handloaders) loading all .38 Spec/.357 Mag/etc ammo with .355"/.356" bullets?
I also understand that barrels can and do vary, but they should be with the .0004" or .0005" tolerance, correct? And barrels can vary a little in bullet preference. But a .358" bullet in a .3546" barrel?? Interesting.
Said another way: Since you said "SAAMI defines the standards, and companies build their products around them" why wouldn't the standard bullet diameter for both calibers be .355"/.356"?