The RCBS 9581: Auto Primer Tube is purposefully crafted for the RCBS Automatic Primer Feed. It efficiently dispenses primers one by one into the primer plug and sleeve. This operation significantly reduces the risk of misfires since there\'s no need for the primers to come into contact with greasy fingers. Also, the nylon primer pick-up contributes to secure operation by preventing the primers from unintentionally falling out. This particular model has an impressive capacity of holding up to 100 primers. It\'s found to be compatible with the Rock Chucker II and Reloader Special Presses. However, please be aware that the RC Supreme is not compatible with this model.