I have a dialed in load for my 6.5 Grendel and it's been shooting great when I shoot it. However I wanted to go to a local 300yd match this weekend and take that gun so I got it out and loaded up about 20 more plus the 15 I had left from last time and none of it shot worth a diddly! The last time I shot the gun at 300 yards it grouped 10 shots in about 1 1/4 inches and would hold that pretty reliably, last night was a disaster with nothing grouping less that about 3 1/2 inches! This whole shooting this is making me old fast and thinking of a new hobby,... maybe growing mushrooms...