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2. Hardness comparison - Wikipedia

   en.wikipedia.org/wiki/Hardness_comparison

   ISO 18265: "Metallic materials — Conversion of hardness values" (2013) ASTM E140-12B(2019)e1: "Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness" (2019)

3. List of copper alloys - Wikipedia

   en.wikipedia.org/wiki/List_of_copper_alloys

   15 – Cupronickel Cu 70.0, Ni 30.0 Wrought – – – – Heat-exchange equipment, valves Ounce metal [5] Copper alloy C83600 (also known as "Red brass" or "composition metal") (ASTM B62) Cu 85.0, Zn 5.0, Pb 5.0, Sn 5.0 Cast 17 37 25 60 — Gunmetal (known as "red brass" in US) Varies Cu 80-90%, Zn <5%, Sn ~10%, +other elements@ <1%

4. Brass - Wikipedia

   en.wikipedia.org/wiki/Brass

   Naval brass, high lead (C485) 60.5: 37.5: 1.8: 0.7: Naval brass with added lead for machinability. Also known as 485, or C485. [46] Nickel brass: 70–76: 20–24.5: 4–5.5% nickel: The outer ring of the bi-metallic one pound and two pound sterling coins and the one euro coin, plus the centre part of the two euro coin. Formerly used for the ...

5. List of military headstamps - Wikipedia

   en.wikipedia.org/wiki/List_of_military_headstamps

   The copper for the casings was acquired by scrap dealers who supposedly were using it to make brass lipstick cases. [18] They made 9×19mm Parabellum and 7.92×57mm Mauser cartridges. IMI , TZZ , or ת צ ( T Tz , or T'aasiya Tz'vaeet , "Military Industries") Israeli Military Industries – Tel Aviv , Israel .

6. Gunmetal - Wikipedia

   en.wikipedia.org/wiki/Gunmetal

   Gunmetal ingot is a related alloy in which the zinc is replaced by 2% lead; this makes the alloy easier to cast but it has less strength. [2]Modified gunmetal contains lead in addition to the zinc; it is typically composed of 86% copper, 9.5% tin, 2.5% lead, and 2% zinc.

7. Percussion cap - Wikipedia

   en.wikipedia.org/wiki/Percussion_cap

   Percussion caps have been manufactured in various sizes to fit snugly over different sized nipples. Nipples for 4.5mm and 6mm percussion caps. The percussion cap, percussion primer, or caplock, introduced in the early 1820s, is a type of single-use percussion ignition device for muzzle loader firearm locks enabling them to fire reliably in any weather condition. [1]