Lee Precision Collet Die Features The Lee Collet Die uses a collet mechanism that squeezes a mandrel into the case neck producing a precisely aligned neck with less runout than a conventional full length sizing die. This matters because a straighter truer neck means ammunition that seats bullets more consistently and feeds with less variation shot to shot. Sizing only the neck also leaves the rest of the case unworked which extends brass life across multiple reloading cycles. For the .45-70 Government handloader chasing tighter groups from a lever gun or single shot rifle that combination of alignment and case longevity is a meaningful accuracy gain. Because the Lee Collet Die requires no case lubrication the loading bench stays cleaner and the process moves faster without a cleaning step before the next sizing operation. The die s Integral Breech Lock threading is a quick change system letting the shooter swap it into any Lee Breech Lock enabled press without re-threading the whole die head. That convenience is especially useful for a handloader who runs several calibers through one press. Sized for a .458 diameter bullet the Lee Collet Die gives .45-70 Government reloaders a precise low maintenance option for building consistent ammunition. Lee Precision Collet Die Specifications Manufacturer: Lee Precision Model: Collet Die Caliber: .45-70 Gov Bullet Diameter: .458 Die Type: Collet Available At: GrabAGun