I shot very well yesterday including groups of 1.0" at 400(only 2 shots), 3.5"at 500, and 3.8" at 600 for 4 shots. I left my ammo in the sun on one of the 1200+ yard round trips to check targets and they went from 75deg to 101deg. Group went up to 5.5" and cases were sticky, when they had not been before. Seems I have been fairly consistent with this gun and load at .6 to. 8moa from 200 to 600 this summer but when the temps rise groups can be up to 1.25moa. I don't feel its always me. Seems to also cause POI change to. So how much do you think over-heated ammo can affect groups and/or POI? PS This not a custom rifle, just an A-bolt with BOSS with an after market trigger and medalist stock.