400NitroExpress
(.400 member)
17/11/05 05:26 AM
Re: Proof loads

DGF:

The purpose of proof testing isn't to determine whether or not the gun will survive a normal load. The purpose is to be certain that the gun possesses the structural integrity to survive a load that produces an excess pressure of "X" ABOVE the normal load without damage (without exceeding the elastic limit of the structure, as Peter stated). For example, the British rules of proof require rifles to be proved with a load that produces not less than 130%, and not more than 145%, of the peak mean operating pressure of the normal load.

"Proofing the gun with the maximum load recommended for this powder/caliber" (a normal load) won't do any good because it won't tell you if you have any safety margin with a normal load or not. If you don't happen to have access to a pressure gun, it will be a trick to develop an appropriate proof load without scattering pieces. Your only option would be to get a proof house to tell you how to assemble a .444 proof load, but I can't imagine any of them being co-operative.
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