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I'm a real novice at this, I'm thinking here is the problem.
Military round out of civilian firearm, firearm is the weak link. (but this may be what I'm wrong about)
The weak link when firing a 7.62x51mm NATO out of a .308 Win chambered firearm is the firearm might not be able to take the additional pressure of the 7.62x51mm NATO. The 7.62x51mm NATO pressure is greater then the .308 Win chambered firearm rating.
Civilian round out of a military firearm, civilian round is the weak link. (think I get this one)
The weak link when firing a .308 Win out of the 7.62x51mm NATO chambered firearm has nothing to do with the pressure on the firearm, but the pressure on the brass of the .308 Win round. The 7.62x51mm NATO chambered firearm has more play in the chamber then the .308 Win chambered firearm.
Is that it?
--or--
I also get the idea, that the commercially made, maximum pressure cartridge of the .308 Win might have a few more grains of powder (becase there is less brass / more space in the .308). This then confuses me, because it sounds like the concern is that the military firearm can't handel the pressure of the max pressure civilian round. So if the .308 Win chambered firearm can take this additional pressure, why cant it take the 7.62x51mm NATO's pressure?
If this is correct, then it would mean then:
To safely interchange 5.56x45mm NATO & .223 Rem. you need the military 5.56x45mm NATO chambered firearm.
To safely interchange 7.62x51mm NATO & .308 Win you need the civilian .308 Win chambered firearm.
Is that it?
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S&W 642 (no-lock) with .38 Spl +P 135 GR Gold GDHP
Glock G31 & G33 with .357 Sig 125 GR. SXT Winchester Ranger
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