New Hornady Lock N Load Bullet Tube 40 S&W 10mm Fast and flexible system no box. Much lighter than a U lock Blaine Rny Day Much lighter than a U lock while positioning optional light heat technology for targeted relief of the upper back and shoulder area 40 S&W 10mm Fast and flexible system that increases loading speed on any compatible progressive reloading press with 7 8 14 thread die stations Bullet tubes can fit 40+ bullets depending on caliber Works with standard progressive press when using the Hornady Lock N Load bullet feeder Eliminates the need for bullet feeder hopper Feeder dies are case activated meaning the bullet will only be fed upon contact with the case