Which One and Why?

.40 the FBI uses it

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Depends on if you can legally shoot a durr or hog with 5.56 in your state.

If you can, I'd say 5.56 since its lighter and a little cheaper.

If you can't then 7.62 is more practical.

Real Fuckin' NATO.

>7.62x39

Because Arsenal slr-107 with alg trigger group and x3 primary arms scope

7.62x54R

Battle rifles are cheating.

And 7.62x39 for any barrel under 14.5", 5.56 for 18"+

Why don't they just make a 6.59x42 and have the best parts of both in one bullet?

5.56x45mm NATO
>cheap
>plentiful
>light so you can carry a great many
>good penetration due to ~3000fps
>many more reasons
It's simply a better round; if you want more punch, upgrade from an AR/AK to a BR.
>t. frmr 11b

This.