The Small Base Sizer Die is for bottleneck type cases used in tight-chambering semi-automatic, pump or lever-action firearms. This sizer resizes cases below SAAMI minimums, reducing the shoulder and body by a few thousandths. It also de-primes the case. NOTE: Not recommended for ammunition used in bolt-action rifles.
Specifications:

Type	Small Base Sizer Die
Caliber	223 Remington
Die Type	Neck Sizer
Die Series
In Set	1
Metal Type
Adapt to Mfg
Shell Holder
Shell Holder Cap