I am usin WW 130 -/+ bullets that I cast and Tite Group powder, my book tells me that the min powder to use is 3.5 and the max is 3.9. I just rechecked my powder dispenser and it showed that I have been shootin 3.3 grains of powder. I have bout 900 rounds left with that load. I have good POI with that load, it's a swinging target and I am firing fast. And I'm gettin good penetration (long ways). Is there something I should worry about with that small of a load? It seems to work good for me, why should I change??