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I own a Remington 760 in .308 and Rem model 700 in .223.
Can I safely shoot surplus miitary 7.62 NATO and .556 in these rifles?
 

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223 can be fired in a 5.56 but 5.56 may cause issues in a 223. 5.56 chambers have a longer throat than the 223 chamber and the 5.56 is rated at a higher pressure by SAMMI (60,000 cup vs 50,000 cup)

The opposite is true for the 308 and 7.62. 7.62 can be safely fired in a 308 but 308 should not be fired in a 7.62. SAMMI pressures for the 308 (62,000 psi) are higher than those for the 7.62 (50,000 psi)
 

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Shoot it! don't believe the hype. Check the primer for pressure sign, and do a chrono if you aren't sure. Most modern rifles are built with WAYYY more strength than what is needed. You'll be fine. Pull the heads and put a soft nose in it and go hunting.

enjoy!
 
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