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2. Metallic silhouette shooting - Wikipedia

   en.wikipedia.org/wiki/Metallic_silhouette_shooting

   Target sizes of the chicken, pig, turkey, and ram targets, scaled to their angular sizes as they would appear if placed at the correct distances from the shooter during the fullbore rifle event with target heights of approximately 4-5 MOA (1.2-1.5 mrad). In the fullbore handgun event target the angular target heights are approximately three to ...

3. 4 bore - Wikipedia

   en.wikipedia.org/wiki/4_bore

   The name, derived from an old English practice of bore measurements in gun-making which refers to a nominally 4-gauge bore, that is, a bore diameter that would accommodate a pure lead round ball weighing 1 ⁄ 4 of a pound. This would imply a bore diameter of 1.052-inch (26.7 mm), however in practice the bore diameter varied greatly as, in ...

4. Gauge (firearms) - Wikipedia

   en.wikipedia.org/wiki/Gauge_(firearms)

   Note: Use of this table for estimating bullet masses for historical large-bore rifles is limited, as this table assumes the use of round ball, rather than conical bullets; for example, a typical 4-bore rifle from circa 1880 used a 2,000-grain (4.57 oz; 129.60 g) bullet, or sometimes slightly heavier, rather than using a 4-ounce (110 g) round ...

5. Counterbore - Wikipedia

   en.wikipedia.org/wiki/Counterbore

   A counterbore hole is typically used when a fastener, such as a socket head cap screw or fillister head screw, is required to sit flush with or below the level of a workpiece's surface. Whereas a counterbore is a flat-bottomed enlargement of a smaller coaxial hole, a countersink is a conical enlargement of such.

6. Crossbow bolt - Wikipedia

   en.wikipedia.org/wiki/Crossbow_bolt

   An unusually small crossbow bolt with a tapered "waist" shaft section and rear skirt compared to a 1 euro cent coin A bolt or quarrel is a dart -like projectile used by crossbows . [ 1 ] The word quarrel is from the Old French quarrel (> French carreau ) "square thing", [ 2 ] specialized use as quarrel d'arcbaleste (> carreau d'arbalète ...

7. Choke (firearms) - Wikipedia

   en.wikipedia.org/wiki/Choke_(firearms)

   Special chokes for turkey hunting, which requires long range shots at the small head and neck of the bird, can go as high as 1.5 mm (0.059 in). The use of too much choke and a small pattern increases the difficulty of hitting the target; the use of too little choke produces large patterns with insufficient pellet density to reliably break ...

8. Squeeze bore - Wikipedia

   en.wikipedia.org/wiki/Squeeze_bore

   The original patent filed by Hermann Gerlich in 1932 [6]. The squeeze bore concept was first patented by German inventor Carl Puff in 1903, [7] [8] even though the general principle was known already in 19th century and later applied in lighter fashion on Armstrong guns, on which only the muzzle yet not the barrel itself was of slightly smaller diameter (to cast off the sealing leather-bag ...

9. 20-gauge shotgun - Wikipedia

   en.wikipedia.org/wiki/20-gauge_shotgun

   The 20-gauge shotgun, also known as 20 bore, is a type of smoothbore shotgun. 20-gauge shotguns have a bore diameter of .615 in (15.6 mm), while the 12-gauge has a bore diameter of .729 in (18.5 mm). [ 2 ] 12-gauge and 20-gauge shotguns are the most popular gauges in the United States .