 The longer 170 mm magazines provide more capacity, but the shorter 140 mm magazines are also popular because of easier handling and often more reliable feeding, leaving the competitor a choice of equipment according to the stage at hand.Competitors may declare major scoring with a 9 mm (.354") or larger bullet, and the most popular cartridges in the Open division are the .38 Super and 9x19 mm handloaded to major power factor.For a while USPSA de facto (but not by rule) prohibited 9×19mm from scoring major power factor in the Open Division due to too high pressures, but 9x19 mm loaded to major became popular again as the power factor was relaxed from to 175 kgr·ft/s to 160 kgr·ft/s, and later raised to 165 kgr·ft/s.