I went to the range the other day and shot proven loads with my 300 WM and 6.5 PRC. The loads I shot have been giving me between .4 and .5 5 shot groups. This day was more like 1" + groups. It was 85 and Humid. Would this effect the groupings this much? Also notice on the 6.5 a heavier bolt lift. The 6.5 was shooting 156 Bergers and 55 grns of RL26. The 300 WM was using 72.5 of IMR 7828. Thanks.