Lee Precision Factory Crimp Die Features The Lee Factory Crimp Die for .404 Jeffery uses a collet design that squeezes the case mouth evenly into the bullet s crimping groove producing a firmer hold than many standard crimp dies offer. This firm crimp forces the bullet to resist movement until pressure builds to a higher level inside the case which creates a more uniform pressure curve as the round fires. The result is reduced velocity variation from shot to shot which directly benefits accuracy and consistency especially in a large dangerous game cartridge like .404 Jeffery. Testing has shown that this crimping method improves accuracy even on bullets that lack a traditional crimp groove. Built for large series 1-1/4 inch by 12 tpi reloading presses this die installs without modification on compatible press setups though a shellholder must be purchased separately. The firm consistent crimp this die produces is particularly valuable for dangerous game cartridges where reliable function under recoil and magazine feeding is critical. Reloaders working up loads for a big bore rifle like one chambered in .404 Jeffery benefit from the added consistency a factory crimp brings to every round. This die gives serious big game hunters an extra layer of confidence in their handloaded ammunition. Lee Precision Factory Crimp Die Specifications Manufacturer: Lee Precision Caliber: .404 Jeffery Die Type: Factory Crimp Die Height: 1.9 Length: 4.5 Width: 1.9 Weight: 0.6 lbs Available At: GrabAGun