Re: 408 CHEY TAC DIES
In the process of developing my .408 loading setup, I settled on two important dies (along with the standard FL sizer): CH4D's Large Bushing Neck Sizer and Straight Line Seater. The Neck Sizer will give you consistent neck tension without working the brass too much (usually good for 2-3 neck sizings before one full length size to reset). The Straight Line Seater Die pretty much solved my runout issues.
Lawton dies are also highly recommended.