Lee's 458 Socom Factory Crimp Die crimps the bullet in place more firmly than any other tool. A firm crimp improves accuracy because pressure must build to a higher level before the bullet begins to move. This higher start pressure insures a more uniform pressure curve and less velocity variation.
Specifications:

Type	Factory Crimp Pistol Die
Caliber	458 Socom
Die Type	Crimp
Die Series	Factory Crimp
In Set	1
Metal Type
Adapt to Mfg
Shell Holder	No
Shell Holder Cap