RCBS Case Forming Dies are used to create brass cases for very hard to find or expensive cartridges out of readily available brass. They are designed to change the case in small steps to eliminate excessive stress on the brass. After forming and trimming, the cases must be full length sized for final forming. These sets may consist of one trim die or a whole set containing up to three dies, expander ball, ream die and reamer depending on the case being formed. Instructions are included with each set.
Forms the 17 Mach IV from the 221 Fireball.
Plastic storage case
Uses the #10 extended shellholder which is included.
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