Utah Shotgunner,
That Is what I believe. My 9x57 and the others I slugged all had .358" barrels, but I'm satisfied some are .356"( I know of a couple reported to be .352"). I use .358 bullets in mine and the others may also accept .358 bullets. If a .358 bullet will fit into the neck of a fired but unsized case, it can be used in that rifle. The lesson here is, if you have hard to find ammo, keep it; you never know when you will need it.
Mike

Last edited by Der Ami; 02/11/20 01:27 PM.