First, the usual disclaimer: This load has proven safe in my 4 ARs, (Two Bushmasters, one DPMS and one Colt). Also one AR (Bushmaster) and a Mini-14, both owned by friends. Also in several bolt actions. Everyone else is encouraged to get several current reloading manuals to use as references, and start at least 10% below and carefully work their way up, watching for signs of problems.
Case: Any 223 Remington or 5.56 NATO, inspected for flaws, full length resized, and trimmed if needed.
Bullet: Winchester .224 55 gr FMJBT/can, available in bulk from Midway.
Primer: CCI 400
Powder: H-335, 25.0 gr
NOTE: Bullets crimped with Lee Factory Crimp die.
Before loading first case, read step by step guides in at least two reloading manuals.