I have some Berry's 180g .40 S&W I've loaded up with Accurate No2 @ 4.0 which resulted in an average of 750 FPS which is about 70 less then manual. However, I'm trying to hit power factor for IDPA with the lightest load possible and this fit's the billet as it was very soft and the three different test guns I used it ran fine (Although that was with only 50 rounds: I want to do another test with a much higher number before going into production mode). My question is this: Should I be worried I was below the books published number of 820~?
Thanks
Thanks