Originally Posted By: Joe Wood
I believe Greener made one with walls near the muzzle .010 and it passed proof. Later he took a penknife and slit the tube to illustrate how thin it was. Point is from a safety standpoint it doesn't make a lot of difference what the minimum wall thickness is but it is very important to be satisfied the barrel has adequate strength in the first foot from the chamber. Now, if its too thin near the muzzle it will be more easily dented and repair can be a problem.


This is quite right.