RCBS MatchMaster Duo 25 Creedmoor 2-Die Set

The MatchMaster Duo pairs two dies for 25 Creedmoor: the MatchMaster seating die with a micrometer adjustable seating depth, and an RCBS full length sizing die. One die sets the case, the other sets the bullet.

The micrometer head is the notable part. Seating depth becomes a number you can write down and come back to, instead of a lock ring you nudge and hope you remembered. That matters while a load is being developed in steps, and again a year later when a notebook is the only record of what worked. The sizing half is a full length die of the pattern RCBS has sold for generations, so there is nothing new to learn about it.