The Hornady Universal Loading Block 480040 is a double-sided block that helps you to load large quantities of nearly any caliber you choose. The Universal Loading Block by Hornady is used with magnum, 308 and 223 size case heads. This Hornady Gunsmith and Reloading Tool also works with Fast-Load Powder Measure Stand to reach every case in the block. This Gunsmith and Reloading Equipment is critical gear for any hand-loader.