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5.56 7.62

5.56 7.62

why they are called 5.56 and 7.62 ?

bullet diameter?

but it seems they are not about diameter

how about .223 .308 , how they measure to these numbers

thanks !

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引用:
原帖由 jacky2038 於 2019-5-6 12:04 發表
why they are called 5.56 and 7.62 ?

bullet diameter?

but it seems they are not about diameter

how about .223 .308 , how they measure to these numbers

thanks !
5.56 and 7.62 are in mm, they are bullet diameters

.223 an .308 refers to 0.223 inches and 0.308 inches, if may take reference of these cailbers after you convert them into mm.

something like this:



In case of doubt, google is your goodest friend

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.223 Remington




5.56mm x 45mm NATO




.308 Winchester




Difference between 7.62mm x 51mm NATO vs .308 Winchester



[ 本帖最後由 rho837 於 6-5-2019 14:22 編輯 ]

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five-five-six 同 two-two-three 在gas pressure方面有差別的...槍管標明係5.56則兩種子彈都可以打,槍管標明係223則只可以打223子彈

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308 have higher pressure than 7.62. they are not completely the same spec.

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All depends on component specification, firearm's manual and ammunitions loading handbook!

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