20 mm caliber is a specific size of popular autocannon ammunition. The dividing line between smaller-caliber weapons, commonly called "guns", from larger-caliber "cannons" (e.g. machine gun vs. autocannon), is conventionally taken to be the 20 mm round, the smallest caliber of …

The 20mm x 102 PGU Suite has an optimized aero ballistic shape that reduces time-of-flight and increased velocity at range for increased probability of hit.

14.5mm×114mm枪弹的极限穿深接近20mm×102mm炮弹，但是后效差距巨大。 实战中20mm×102mm炮弹有更好的的存速能力，所以实战条件下20mm的作战效能更高。 反对另一位答主的意见. 14.5×114枪口动能大约30kJ. 20×102 炮口动能 大约70kJ. 这俩就干脆不是一个级别的玩意，20炮比14.5重机威力大他没说错，但可不是差距不大，而是差距非常的大. 20炮弹不只有14.5机枪弹两倍以上水平的初始动能，还因为有其将近2.5倍的弹丸重量拥有更小的 风偏 和更 …

The 20 mm x 102 Multipurpose Low-Drag (MP LD) round is the superior aircraft ammunition, designed to defeat multi-spectrum target types up to light armored vehicles. The projectile’s low-drag design maintains higher velocity and reduces the time of flight, compared to the M50 series.

High explosive incendiary operational cartridge suitable for use on M39 and M61 cannons.

The Sky Viper 20x102mm is the next-generation Bushmaster® Chain Gun® under development for multi-role functionality on land, air, and sea platforms.

当然，苏联的30mm炮弹的动能还是比美国25mm高不少的，至少网络上一些地方流传的苏联30mm弹不如美国25mm弹也是错误的。 37mm机炮中，苏联在二战中使用的NS-37拥有最高的动能。 而德国的mk103机炮在重量接近的情况下，竟然动能不到前者的一半。 还有，德国的mg151机炮动能真心不高，还没有苏联14.5mm枪弹更高，也不如日本的99-2机炮。 无聊计算了一下 都用的常用弹种 记录下来方便以后参考 20-30mm Shvak（20x99mm） 28459J 2.8万焦耳 mg …

20mm Ammunition 20x102mm Northrop Grumman is a leading producer of 20mm tactical and training ammunition, delivering up to three million rounds per year for the U.S. Army, U.S. Navy, NAVSEA, and U.S. Air Force. These rounds include the PGU-27, PGU-28, PGU-30 for the Air Force and NAVSEA.

The M940 MPT-SD (multi-purpose tracer, self-destruct) shell is a 20×102 mm round produced by General Dynamics primarily for an anti-aircraft role. It has a range of over 2,000 metres (6,600 ft). The round includes a red tracer to aid in targeting.

20 mmx102 HEI-T (M56 A3)FEATURES