I thought I know there is to know about reloading and boy, was I wrong. I did a boboo yesterday in the form of 308 loaded with 168 grain Nosler Competition and 45 grain of BLC-2. The load was developed during winter when temperature was averaging 60 degrees. When fired at temperature of around hundred degree, the result was catasrophic. You can see from the picture below. Call Hogsdon and was informed that when using sphirical powder, the load that was develop during winter should never be used during summer. I told Hodgsdon that I know that but I'm 2 grain below max. It didn't even crossed my mind besides it never happened to me before and I had been reloading for over 20 years. Can anyone share some light on this.