Hornady M-1 Case Tumbler Caliber_7MM RUM Leupold Standard steel bases are

Leupold Standard steel bases are designed specifically to withstand the toughest recoil

Other inserts sold separately

ensuring the core and jacket are locked in one piece during expansion to retain mass and energy

Bullet Weight: 12

then this kit is not necessary

Hornady M-1 Case Tumbler Caliber_7MM RUM Leupold Standard steel bases areThe Hornady M 1 Case Tumbler was designed for ultimate brass cleaning as well as ease of operation. The internal cyclonic action cleans and polishes your brass in no time at all and the included media sifter easily separates the media from the brass. The M 1 Case Tumbler will hold approximately 400 . 38 special cases, or 180 . 30 06 cases, and would make a great addition to your reloading equipment.