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2. 4.5×26mm MKR - Wikipedia

   en.wikipedia.org/wiki/4.5×26mm_MKR

   Its 4.5 mm (0.18 in) caliber boat-tail spitzer bullet was 22 mm (0.87 in) long and made by cold rolling solid copper wire. [ 1 ] The lightweight bullet of 1.58 g (24.4 gr) reportedly achieved a muzzle velocity of about 1,000 m/s (3,300 ft/s) and a muzzle energy of 790 J (580 ft⋅lbf).

3. List of naval guns by caliber - Wikipedia

   en.wikipedia.org/wiki/List_of_naval_guns_by_caliber

   57 mm kan M/89 (Maxim-Nordenfelt 57 mm fast shooting naval gun L/48 model 1889) Sweden-Norway: 1890s - World War I 57 mm (2.2 in) 57 mm kan M/89B (Finspång 57 mm fast shooting naval gun L/55 model 1889) Sweden-Norway: 1890s - Modern 57 mm (2.2 in) 57 mm kan M/92 (Maxim-Nordenfelt 57 mm fast shooting naval gun L/48 model 1892) Sweden-Norway

4. 4.5-Inch Beach Barrage Rocket - Wikipedia

   en.wikipedia.org/wiki/4.5-Inch_Beach_Barrage_Rocket

   The 4.5-Inch Beach Barrage Rocket, also known as "Old Faithful", [1] was a 4.5-inch (110 mm) rocket developed and used by the United States Navy during World War II. Originally developed from the "Mousetrap" anti-submarine rocket, it saw widespread use during the war, being replaced by more powerful rockets toward the end of the conflict.

5. Shot grouping - Wikipedia

   en.wikipedia.org/wiki/Shot_grouping

   The group on the right measures about 7 mm and was fired at about 90 meters, which equals ⁠ 7 mm / 90 m ⁠ = 0.08 mils (0.3 in group at 100 yards, approx. 1.047′×0.3 = 0.314′). In shooting sports , a shot grouping , or simply group , is the collective pattern of projectile impacts on a target from multiple consecutive shots taken in one ...

6. .177 caliber - Wikipedia

   en.wikipedia.org/wiki/.177_caliber

   It is also used in field target competitions, where it competes with .20 caliber (5 mm) and .22 caliber (5.6 mm) rifles. Steel BBs are typically slightly smaller than lead BBs at 0.175-inch (4.4 mm) diameter, although the bore diameter of the barrel are the same. Some air guns are designed to accept .177 pellets, .177 lead shot, or .175 steel ...

7. 4.85×49mm - Wikipedia

   en.wikipedia.org/wiki/4.85×49mm

   The cases of these experimental 5 mm rounds were reformed 5.56 mm NATO cases, although the shape of the bullet was a scaled-down version of an earlier experimental round, measuring 6.23×43 mm. [4] A round measuring 5×44 mm at the neck, made in 1970, was effectively the prototype of the round eventually adopted, although under the name 4.85× ...