I'm going by memory here and I don't recall the exact book I read it in but it was about the Colt factory and how they did things back in the days of the cap and ball revolvers.
They proofed revolver cylinders by loading a maximum amount of powder followed by a roundball in each chamber.
Then, they placed the loaded and capped cylinder onto a jig with the chambers pointed upward and lowered a weight down against the cylinder face.
Then, they fired all of the chambers at the same time.
I don't remember if it said how heavy the weight was but anything at all would drastically raise the pressures inside the chambers to something far greater than the gun could ever be loaded to in normal use.
They (the Colt engineers) came up with this method following the failure of some of the cylinders on the initial production of the Whitney made Colt Walkers.
Sam Colt was insistent that this method would be used on all of his cap and ball pistols made following the Walker. Sam Colt was a perfectionist and doing tests like this to insure his guns were safe is part of the reason Colt firearms have always been known for their high quality.
I have no idea at all about how the Italian, British and other European companies proof their guns now but, that's the way Ole' Sam did it.
They proofed revolver cylinders by loading a maximum amount of powder followed by a roundball in each chamber.
Then, they placed the loaded and capped cylinder onto a jig with the chambers pointed upward and lowered a weight down against the cylinder face.
Then, they fired all of the chambers at the same time.
I don't remember if it said how heavy the weight was but anything at all would drastically raise the pressures inside the chambers to something far greater than the gun could ever be loaded to in normal use.
They (the Colt engineers) came up with this method following the failure of some of the cylinders on the initial production of the Whitney made Colt Walkers.
Sam Colt was insistent that this method would be used on all of his cap and ball pistols made following the Walker. Sam Colt was a perfectionist and doing tests like this to insure his guns were safe is part of the reason Colt firearms have always been known for their high quality.
I have no idea at all about how the Italian, British and other European companies proof their guns now but, that's the way Ole' Sam did it.