Hornady reloading dies represent the finest in machined craftsmanship. Articulated details offer more precise reloading, by offering easier adjustments, better alignment and smoother functioning. With one of the finest internal finishes in the industry, Hornady custom grade and match grade dies provide a lifetime of reloading. They're so well crafted that they're guaranteed never to break or wear out from normal use. Specifications: - Series 1 - 300 AAC/whisper - 2 die set - full length - use shellholder number 16.