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There is a term they taught us when we were going to gunsmith school. It was called a SCLID. A Sudden Catastrophic Load Induced Disassembly. A much nicer way of saying gun go boom.
The problem with the 1903 isn't one that can likely be solved with a proof load. The problem would manifest itself if you ever had a case failure. I am not a ballistics expert, a metallurgy expert, or a materials engineer, but I believe the pressure spikes are different between a proof load and a case rupture. The latter is what will cause the gun to have a SCLID.
I know a lot of friends that own low number springfields, and honestly, most of them shoot them. They are smart guys who know the risks. Many are even gunsmiths. But one of the first thing they told us to do if we ever got a low number springfield in the shop was to red tag it as unsafe to shoot. The liability of what-if is too high for a lot of gunsmiths, myself included.
The problem with the 1903 isn't one that can likely be solved with a proof load. The problem would manifest itself if you ever had a case failure. I am not a ballistics expert, a metallurgy expert, or a materials engineer, but I believe the pressure spikes are different between a proof load and a case rupture. The latter is what will cause the gun to have a SCLID.
I know a lot of friends that own low number springfields, and honestly, most of them shoot them. They are smart guys who know the risks. Many are even gunsmiths. But one of the first thing they told us to do if we ever got a low number springfield in the shop was to red tag it as unsafe to shoot. The liability of what-if is too high for a lot of gunsmiths, myself included.