Manufacturer: RCBS 38260
RCBS Machines their shell holders the very tightest tolerances to ensure a secure, firm grip on your cases. Using the very finest steel available, they create these shell holders to prevent you from running into headspace and sizing problems.
Extended shell holder for use with the RCBS Competition dies.
.221 Remington Fireball
.222 Remington Magnum
7mm Thompson Center Ugalde