Explosives . wder gases t<- the base of the pressure phi- i- hi-by the first wad. :t tons persquare inch. If the velocity be higher than tin- the Bhot are deformed and•.•it<l too much, if lower the killing power of the pellets i- reduced; it tter for the velocity to fall below these limit- than to rise above them, a- Bhooting i- generally at short ranges. If the pressure be too low 1 Y il ajijiliai - • sing patterns act Vennin et < ts et Expbmfa, p. 149, ^l- . M - - . 1915, p. Fig. 00. Field Proof Gun From Arms and Explosives, 1911, p. ., (Webley & Scott) 333 334 EXPLOSI
Explosives . wder gases t<- the base of the pressure phi- i- hi-by the first wad. :t tons persquare inch. If the velocity be higher than tin- the Bhot are deformed and•.•it<l too much, if lower the killing power of the pellets i- reduced; it tter for the velocity to fall below these limit- than to rise above them, a- Bhooting i- generally at short ranges. If the pressure be too low 1 Y il ajijiliai - • sing patterns act Vennin et < ts et Expbmfa, p. 149, ^l- . M - - . 1915, p. Fig. 00. Field Proof Gun From Arms and Explosives, 1911, p. ., (Webley & Scott) 333 334 EXPLOSIVES the patterns are bad. if too high the gun may be spoilt or even burst. Therecoil of the sportsmans gun should be about 16 feet per second, whereasthat of an express ririe is usually about IT feet per second, and that of a militaryrifle, which is fired much more rapidly. is ]<» feet per The French _ a velocity of 755 feet per second over a range of15 metres [16-4 yards in a 16-bore gun with the standard loading. The pressure is increased by using felt wads that are harder or slightly_• r in diameter or by having a longer or harder turnover. The velocityis also increased slightly by the same alterations. The opposite changes, ofcourse, produce the opposite effects. The ballistics are affected also by thestrength and nature of the cap in the cartridge case. If by adjusting theseelements it is not possible to produce the desired result it is necessary toalter the weight of
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