I took my open comp G17 out to the range today to chronograph my ammo. I shot 10 rounds of 125 grain fmj 8.2grains of HS6 Oal 1.135 and had three failures to fire. I then took 10 rounds of 125 grain fmj 8.0grains of HS6 Oal 1.135 and had four failure to fire and had three failure to fire with 7.8 grains of HS6. I am trying to get 9MM major power factor of 170 or better. I am using new Winchester small pistol primers. Upon checking the unfired rounds, they all had powder in them. they had full hits on the primers. My 9mm minor loads of 6.4 grains of HS6 Oal of 1.135 had no problems at all. Any ideas of what happened?