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The nickel metal barrels are equally tested, being subjected to the strain 30 per cent in extra of strain produced with the cartridge the barrel is intended for being chambered for. Right after proof firing a barrel is carefully inspected and when it demonstrates the slightest indicator of pressure, or imperfection, it really is condemned. A barrel that passes the proof is future straightened, then provided the 2nd or “finish” tedious. It truly is then straightened yet again, and then it really is subjected to what is referred to as the “Winchester” or “Guide” examination, which by no means fails to disclose any irregularity in the interior of the barrel. This take a look at is recurring after the barrel is rifled, for the objective of detecting any achievable disturbance of the bore during the latter process.
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This thread has actually been an incredible help and has set my brain at relieve with respect into the proof markings over a Product 1894 Winchester shotgun models compared which I am currently restoring.
According to what I have noticed and read in other resources, the oval (P) proof mark wasn't introduced until eventually 1908. Just before that point, Winchester marked “OF” (outside fitted) on The underside on the barrel underneath the forend stock with the mail order barrels. I have see several of them on Model 1885 Solitary Shot Rifles that predate 1908.
As I've read, the barrels started to obtain the “WP” at all over 1905, then by 1908 both equally the receiver and barrel were stamped Along with the “WP”. Were being assembled receivers and barrels proved for a unit (to get the “WP”), or were being barrels proved utilizing a take a look at receiver? If examined being an assembled receiver & barrel, I could comprehend stamping both equally at the same time, but at what position is definitely the evidence used, subsequent to the ultimate steel sharpening but ahead of the bluing?
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