Sir,
But the 5.45mm round used by the Russias in the AK 74 is light weight and lethal and as accurate as a 5.56mm and easier to handle. Why dosent the Indian army try to use a lighter round with a small airspace infront of it. The Ballistic Gelatin brick has proven that the bullet tends to give the person at the recieving end a verry terrible pain and is more successful destruction of all the internal organs. The bullet in the AK 74 tends to yaw causing a severe pain.
Actually both 5.45 & 5.56 are spire point bullet and have almost same ballistics, range and weight, SS109 ( Indian Army ) is improved 5.56mm meant for extended range with more energy and velocity which enable the bullet to shred BP jackets also it have a steel core, Though both rounds gives the terrible pain and fatal wounds,
When the bullet impacts at high velocity and yaws in tissue, fragmentation creates a rapid transfer of energy which can result in massive wounding but relatively low hydrostatic shock effects, which enable these tangos to keep fighting on, until someone shoot him on head or chest,
Where as M43 ( 7.62X39mm ) round of AK on impact
High hydrostatic shock effects put liquid ( Blood ) in motion by 'shock waves' or hydraulic effects... with liquid filled tissues, the effects and destruction of tissues extend in all directions far beyond the wound axis,
hydrostatic shock can produce remote neural damage and produce incapacitation more quickly than blood loss effects ( Hence effective than 5.56mm in terms of incapacitation ). The debate between proponents of bullets that are "light and fast" versus bullets that are "slow and heavy" often refers to this phenomenon.
Links between brain injury and ballistic pressure waves
BOTH the rounds have a tendency to yaws in tissue, fragmentation creates a rapid transfer of energy which can result in massive wounding..
NEW 6.8x43/45mm will have same range and same velocity of 5.56x45mm round and also the effects of 7.62x39mm on impact, hence its the better round!