I took acouple of boxes of S & B ammo to the range the other day to shoot in my Hi-Power and had bad results. Out of the 100 rounds 14 failed to fire and numerous others needed 2 or 3 strikes to fire. The rounds that failed had very shallow indents. I don't know if it's the ammo or gun. My CZ, SIGs and HKs ran fine with S & B but my BHP has worked perfectly with other brands of ammo, UMC, WWB, Magtech, AE and Speer. The pistol was bought NIB but the mainspring feels very light. Any ideas out there?