Below is the first handloads out of my new Cooper. The small group in the center was fired first from a cold clean barrel. Do you think the load got worse as it was increased or the rifle just doesn't like to be shot warm. Temperatures were in the high 50's. I didn't allow the barrel to get hot but it was warm during the last two groups. I guess the only way to be sure is to shoot the same loads again but this time in reverse order. Regardless, if the load is that sensitive I probably should abandon it.