99guy: I don't think the picture posted by Jsgwoodsman shows a "poorly struck 358" - I contend it shows a well "struck" (roll stamped) caliber designation on a barrel. That was "made" (struck or rolled) WITH a roll die that has a "5" that was created being a few thousandths shorter than the 3" and the "8" that adjoins it!
This is what I have observed for decades now!
It is the tiniest of aberrations but it is "right".
I'd bet on it - based on my experiences and the previously referenced depiction in Roger Rules book as well.
Long live the Rifleman's Rifle.
Hold into the wind
VarmintGuy