Don't get discouraged. My 340 M&P is my favorite gun. If I don't shoot it for awhile, it hurts and I'm lucky to get through 20 rounds also. But shoot it regularly and you can shoot non-stop. I just finished loading up 1000 .357 Magnums -- 158 JHP's over 14 grains of 2400 with a magnum primer. Duplicates a hot factory load perfectly. Last weekend I went through a box of 50 in about 20 minutes.