most of others give most of differences- note on leade, 5.56 NATO standard bullets are now longer and heavier- 62 grain or 70 grain- than original 52 and 55 grain so leade is about 2/3mm longer than .223 commercial chambering. Rifleman had article about 3 months back on chamber difference and the warning on pressure. A 5.56 Nato with the SS109/855 bullet will be interference touch of rifling in a new, tight .223 chamber-could be a pressure damage problem. Reloading surplus 5.56 cases with a 50/52 grain spire point for use in .223 chamber will be OK on leade/freebore- full lenght size case and check overall loaded length.RN
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