The U.S. Army Marksmanship Unit regularly published a reloading how-to article on the USAMU Facebook page. One excellent Handloading Hump Day post covered preparation of once-fired 5.56x45mm brass. This article, the first in a 3-part series, has many useful tips. If you shoot a rifle chambered in .223 Rem or 5.
5.56 Reloading - part 1 - case prep and prime
5.56x45 NATO M855 Green Tip LC Brass Milspec SS109 Bullet Expanded Ammo Breakdown Cartridge Exploded Ammunition Ballistic Concepts
600 Round Can - Sealed Battlepacks - 5.56 NATO 62 Grain Green Tip LAP Ammo by PMC on AR-15 Stripper Clips - 5.56KBP - Packed in Metal Canister
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How to Prep Milsurp 5.56 Brass for Match Use — USAMU Tips « Daily Bulletin
5.56x45 NATO M855 Green Tip LC Brass Milspec SS109 Bullet Expanded Ammo Breakdown Cartridge Exploded Ammunition Ballistic Concepts