Two 4x4 tables are set up 25 feet from the shooter, each table has 5 pins lined up side by side, two shooters go to the line, there is a table for each, you put your spare mags where you want, load 6 into each mag, load the gun, start at the low ready, and when the "go" command is given, begin firing until all your pins are off the table. First to clear the table wins.
you can have as many mags as your heart desires, and use any handgun up to 44 mag. just no more than 6 in any magazine