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Case colouring refers to this pattern and is commonly encountered as a decorative finish on firearms. Case-hardened steel combines extreme hardness and extreme toughness, which is not readily matched by homogeneous alloys since hard homogeneous steels tend to be brittle, especially those steels whose hardness relies on carbon content alone.
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The case volume or case capacity and barrel bore area can be mathematically related to obtain a case volume to bore area ratio in metric or imperial units. O r a t i o = V o l u m e c a s e A r e a b o r e {\displaystyle {O_{ratio}}={\frac {Volume_{case}}{Area_{bore}}}}
The modern metallic case can either be a "bottleneck" one, whose frontal portion near the end opening (known as the "case neck") has a noticeably smaller diameter than the main part of the case ("case body"), with a noticeably angled slope ("case shoulder") in between; or a "straight-walled" one, where there is no narrowed neck and the whole ...
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A headstamp is the markings on the bottom of a cartridge case designed for a firearm.It usually tells who manufactured the case. If it is a civilian case it often also tells the caliber: if it is military, the year of manufacture is often added.
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