I have a SPS tac 308, all that is stock on it is the barrel and action. Everthing else has been changed. I am loading 175gr SMK, 44.0 gr IMR 4064 powder, CCI BR2 primers, Winchester brass,2.80" OAL. With this load I get 2600 FPS out of my gun, but when the temps here in Fla reach 90+ I start...