I just ordered a couple of Sigs in this caliber as a compromise on size of handgun and still keeping a 40+ caliber. I haven't kept up with this caliber much. In fact I only knew of 155 and 180gr bullets. Now I find a bunch of different loads and several velocities of some of the loads. What's the best load for the 40 S&W for self defense. I have always been of the mind set that heavier bullets are better but that isn't always the case. What would you recommend for the 40 and why?