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  1. .308 or .311 projectiles for SIG 556R?

    SIG Sauer Rifles
    I'm trying to find out which diameter the projectile the SIG 556R bore is optimized for .308 or .311? I have heard you can reload with either with minor performance differences. I'm looking to reload with a 123-125gr 30 cal bullet. Anyone have any knowledge of this or experience reloading for...
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