My-Analogous
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7.62x51 is generally more powerful than 7.62x39These are all different calibers of bullets. The first number, e.g 5.56 or 7.62, is the width of the bullet.
The second number, e.g 39 or 51, is the length of the cartridge, which contains the powder.
So 7.62x51 is generally more powerful than 7.62x39, but the cartridge is also much heavier (the actual bullet is the same size). The G3 uses 7.62x51, AK47 and Type56 (Chinese AK used by Pak forces) uses 7.62x39.
5.56x45 is used in M4, M16, HK-416, and many other NATO weapons.
Each is good for specific purposes and was designed with different tactics and equipment in mind, so which one is 'better' is highly debatable, but for Pakistan it's best if we stick to the Calibers we already use because shifting the entire military to a different caliber will be expensive.
So it is powerful based on what? range i guess or some thing else?