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AR-15 .223 vs Mil-Spec 5.56mm info

I am the proud owner of a 550B and enjoy reading the topics presented in these forums. This is a link that I got from Cheaper than Dirt explaining the difference between .223 and 5.56... I hope this helps as far as knowledge is concerned. I have been reloading for only 15 months but have had a lot of help from many sources.....SAFETY is always #1. Enjoy the reading.

 http://blog.cheaperthandirt.com/ar-15-223-mil-spec-5-56mm-chambers/?utm_source=newsletter&utm_medium=social&utm_content=chronicle0315&utm_campaign=20140315-social-newsletter-ar15-223-vs-milspec-556-blog-post

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