The Lyman MSR Precision Die Set for 450 Bushmaster is designed with the modern sporting rifle enthusiast in mind. This 4-die set includes a Small Base Size die that ensures seamless chambering and a separate Taper Crimp die for a firm bullet hold. Each set is accompanied by an Ammo Checker cartridge Go gauge all securely packed in a durable clear cover storage case. Ideal for those looking to achieve high-quality reloads with precision and ease.