Description
The RCBS Matchmaster Comp Seat is a seating die in 223.
Dies do the shaping in reloading. A full-length die resizes the whole case back to factory dimensions, which is what makes ammunition chamber in any rifle. A neck die works only the case neck, leaving the body fitted to the chamber it was fired in – less working of the brass, but the ammunition is then specific to that rifle. A seating die sets bullet depth.
Dies are cartridge-specific: these are 223 and will not work another case.
Check the thread. Most modern presses take 7/8-14 dies, but large cases and some presses use 1-1/4-12, and the die has to match the press.
This is a part or accessory, not a firearm, and ships directly to your address.
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