8)
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=387029168
WTH is that?
ONLY with a good barrel and ONLY with a 30lb spring ;)
Proof Pressures for 10mm are 130% minimum and 140% maximum as set by SAAMI
The formula is based on the Maximum Portable Lot Mean MPLM of 38,700 psi
38,700 x 1.30 = 50,310 psi and 38,700 x 1.40 = 54,180 psi
Minimum and Maximum
50,310 psi - 54,180 psi these would be rounded to 50,500 psi - 54,000 psi
Wow that is getting up there!
And proof loads are meant to only be fired in carefully controlled conditions where extreme precautions are taken (read remote firing using a clamp style rest).
Not sure what I would do with these other than pull them down and see what was in them.
I'd say it takes special brass to handle those pressures used in the PROOF testing. BTW all Smith & Wesson 3rd gen were marked with a "P" on the barrels as PROOF tested. 8)
Quote from: The_Shadow on January 15 2014 08:34:10 AM MST
I'd say it takes special brass to handle those pressures used in the PROOF testing. BTW all Smith & Wesson 3rd gen were marked with a "P" on the barrels as PROOF tested. 8)
I don't think so. The purpose of the proof round is to validate the firearm's pressure containment ability. Using special brass would not be testing the gun as a pressure vessel.
In many places all guns are required to pass a proof test and be so marked prior to retail sale. The government used to require this for service rifles I know from my Garand addiction. I assume they still do.
Based on this, and other reading I have done in the past, a proof round is just a round overloaded to a specific pressure.
Why I mention the brass may be special for pressure rounds, it could be special alloy, or heat treated specific for the test procedure, much like that of the Copper Crusher disk used for pressure test, the disk has to meet a specific criteria.
The barrels can be tested separate from the guns. By that I mean, after the barrels have been machined, stress relieved, then they can be placed in a holding and firing fixture, then in a special containment to be fire tested. Those that pass, showing no issues, will move to pistol assembly.
Since its hornady 10mm it probably is loaded to below swamp fox pressure :-p