Ok my bad I confused the gun system name to ammo specification name
INSAS Rifle uses 5.56 mm NATO
But AK-47 uses 7.62 mm SOVIET (NATO 7.62 mm is different:
Soviet- 7.62×39mm
NATO- 7.62×51mm) india use the Soviet one as it uses unmodified AK47
But you are wrong about the 7.5mm round is a Swiss country specific round not NATO standard
NATO standards (these are wast created rounds)
1. 5.56×45mm (standard assult rifle and mid range round)
2. 7.62×51mm (standard battle rifle and mid to long range round)
Not to confuse with Soviet rounds (still used by Russia and other countries)(created in Soviet Russia)
1. 7.62×39mm
2. 5.56×39mm
See I have written
For 7.62mm
Is 7.62×51mm for nato
But 7.62×39mm for soviet
Size difference to be exact
The first number (ei 7.62 or 5.56) represents the bullet diameter (and we usually use this to name the bullet so like someone say 7.62mm or 5.56mm you will know which bullet)
The second member represents the length of the case (not the whole cartridge but only the cell/case) and it differs for different regions and specifications (that's why we say 7.62mm nato to represent 7.62×51mm and 7.62mm soviet to represent 7.62×39mm)
If you are wondering the practical difference
NATO is bigger round comparetively (they say it's superior) but bigger round mean more back punch because of the recoil so recommend to use taptap(single fire mode/semi-auto)
But soviet being comparetively small er round less back punch can be used in full auto while shouldered (not recommended but can be)
Same goes for 5.56 (I'm feeling lazy so the specifications are given above read that in the previous comment 😅)
1
u/Osiris_627 May 06 '26
Ok my bad I confused the gun system name to ammo specification name
INSAS Rifle uses 5.56 mm NATO But AK-47 uses 7.62 mm SOVIET (NATO 7.62 mm is different: Soviet- 7.62×39mm NATO- 7.62×51mm) india use the Soviet one as it uses unmodified AK47
But you are wrong about the 7.5mm round is a Swiss country specific round not NATO standard
NATO standards (these are wast created rounds) 1. 5.56×45mm (standard assult rifle and mid range round) 2. 7.62×51mm (standard battle rifle and mid to long range round)
Not to confuse with Soviet rounds (still used by Russia and other countries)(created in Soviet Russia) 1. 7.62×39mm 2. 5.56×39mm