The Hornady Lock-N-Load Rifle Bullet Feeder is designed for the Lock-N-Load AP reloading press. Sold as a complete unit for 22 caliber bullets, a conversion kit for 30 caliber bullets is also available, giving the reloader the versatility to load the two most popular calibers. Plus, it's compatible with other presses and uses the industry standard 7/8-14 die threads.