Mil Spec FoS

[Keep The Change]

I personally would not be comfortable with FoS less than 3.0 if I am holding the thing in my hand.

The first thing I thought of reading the post was - pressure vessel design - which has direct similarities to gun barrels.

Not knowing what the mil spec was, or some rule of thumb design factors from a very trusted source, I would consider reviewing some of the industry standards for FoS which you can find here:

http://www.engineeringtoolbox.com/factor..._1624.html

Hope that helps!

I know what you mean SG. If that FoS is against the yield stress. That means if you somehow double the pressure in the chamber, your barrel will only yield. It won't fail, just yield, probably locally. Well if the pressure is doubled, what is going to happen with that BCG as it is coming back. I think the barrel would be the least of your concerns.

If you like FoS greater than 3 when your body or life depends on it, I won't tell you the sort of FoS or Margins of Safety we go down to in the aircraft industry. You might not fly again.
LOL!!