RCBS Cowboy Dies - Manual (Page 10)

seater plug until the proper depth (in the middle of the crimp groove) is
obtained.
Next, adjust the die to crimp. While the uncrimped cartridge is still in the
seater die, unscrew the seater plug several turns. Screw the seater die downward
until you feel it touch the mouth of the case. Lower the reloaded cartridge and
adjust the seater die down about 1/8th of a turn. Run the reloaded cartridge
into the die and then check the crimp. If more crimp is needed, repeat the pre-
ceding step by adjusting the die downward 1/8th of a turn at a time. Over-
crimping of the cartridge will cause bulging and may affect chambering. After
you are satisfied with the crimp, run the completed cartridge into the seater die,
set the large lock ring and then lower the seater plug until it touches the bullet.
Tighten the seater plug lock ring. Once the seater die is properly adjusted, the
bullet is seated and crimped in one operation.