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Old December 29, 2012, 12:08 PM   #7
Clark
Senior Member
 
Join Date: December 4, 1999
Location: WA, the ever blue state
Posts: 3,077
At the risk of being redundant, 1 1/8" OD and .45" ID chambered for 45/70 would be hard to blow up.
I could do a thin wall formula for stress, and maybe a Lame's formula for thick wall, but to do it right you would need one of Roark's open end tube formulas.

So at the cave man level, I have tried to blow up many guns.
That one would be a ~~.250" thick chamber wall.
I don't care if the gun is 150 years old or new, unless it is a Ruger 454 made of specialty steel, this is my guideline:
.100" thick, I can't blow it up.
.050" thick, blowing up is easy.
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