With a Loading Block for the S&W 617 10 Shot Speedloader you can pre stage your rounds for some fast and fun shooting. A simple push down on the Speedloader clicks in 10 rounds in less than 1 second.... transfer them to the cylinder.... push again and click your 10 empty chambers are full. The average person with a little practice can be reloading their revolver in less than 5 seconds. The Four Banger speed block holds 50 rounds of 22 Long Rifle. If you load 10 rounds in your 617 Speedloader and 50 rounds in the loading block you'll have a total of 60 rounds ready to snap into your revolver. Buy one today and see how fast you can empty it!