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This was a 30% increase from that of the .25 ACP. Ellifritz stated: "I would skip carrying the "mouse gun" .22s, .25s and .32s." However, he also pointed out that shot placement is more important than caliber (a common argument from .25 users) and concluded his review by stating: "caliber really isn't all that important."
The 20-gauge shotgun is the next most popular size [citation needed], and is popular for upland game hunting. The next most popular sizes are the .410 bore and the 28 gauge. The least popular sizes are the 10 gauge and the 16 gauge; while far less common than the other four gauges, they are still commercially available. [citation needed] [9]
In the anti-materiel role, a 25 mm weapon armed with armor-piercing rounds can disable many types of aircraft and ground vehicles, including some main battle tanks. The US military uses 25 mm weapons in their AV-8B Harrier, AC-130 gunship, M2 Bradley, LAV-25, F-35 Lightning II and as a standard ship-based munition in the Mk 38 autocannon.
Shotguns are classed according to gauge, a related expression. The gauge of a shotgun refers to how many lead spheres, each with a diameter equal to that of the bore, that amounts to one pound (454 g (1.0 lb)) in weight. In the case of a 12-gauge (18.5 mm) shotgun, it would take 12 spheres the size of the shotgun's bore to equal a pound. [12]
Handgun cartridges Cartridge name Bullet diameter Case length Cartridge length Type Source in mm in mm in mm 2.34mm rimfire (for Swiss mini gun) .092 2.3.240 6.1: Rimmed, rimfire
Military use of combat shotguns through the 20th century has created a need for ammunition maximizing the combat effectiveness of such weapons within the limitations of international law. 12-gauge has been widely accepted as an appropriate bore diameter to provide an effective number of projectiles within an acceptable recoil. Early 12-gauge ...
Explosive shells were not available and the cylinder walls are too thin for shot-shells. The weapon is similar to the earlier 12-gauge version, except the barrel was either 9.5 inches (240 mm) or 9.75 inches (248 mm), and used hard rubber rear grips instead of wood. The First Model 25mm was a larger-bore version of the 12-gauge shotgun, using ...
Overall, it was more comparable to the 20 mm Oerlikon, though vastly inferior to the 40mm Bofors weapons used by the US and allies in every respect except rate of fire (and only barely in that respect: the Bofors could put out a sustained 120 rounds per minute because of its constant-fire top-fed ammo clip design, whereas the 25mm's frequent ...