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The taper behind the case neck is different angle, for the 7.62 and 308 so this applies PER DPMS anyway
While you can physically fire either 308 or 7.62 NATO from a 308, you will see reduced accuracy from increased wear in the throat of the rifling and a higher chance of erratic cycling, including a higher chance of failures to extract. It is for this reason we recommend using only commercial 308 in a 308 barrel. Will it work,...yes. Is it ideal, not necessarily
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In DPMS rifles, 7.62x51 or .308 is allowed in 7.62x51 chambers. Do not use 7.62x51 in a .308 chamber. It will function, at times flawlessly, however over time issues may arise. That is the long and short of it. Use the ammo your rifle was designed for, effectively whatever is stamped on your barrel is what you should use except in the case of 5.56x45mm (.223 can be used) and 7.62x51mm (.308 can be used).
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