well- at least at the breech - that would make sense
as the size goes up -the frame is wider and the firing pin spacing increases so the barrels at the breech end must be bigger -
a wider set of barrels - with the same bore size - would necessitate more metal at the back end
the question would be- as the barrels are struck and the balance of the gun is adjusted
how much of this rear end affect will translate to thicker walls all the way down the tubes
i would guess - it depends on the gun and may not be a hard and fast rule
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