X-10 Rifle Bullet Feeder Caliber Conversion Kits contain everything needed to connect the X-10 Rifle Bullet Feeder Collator (sold separately) to the X-10 Progressive Reloading Press. The kits include a caliber-specific micrometer-adjustable seating die assembly with an on/off switch. The bullet feed system is seamlessly integrated into the X-10 Tool Head to feed and seat bullets in the same station, freeing up a station for bullet crimp or other operations.