I am assuming that's your 6BR again, and yes at 1000 yards any little wind change is enough to cause a miss, I know my 6mm creedmoor is the same, add or subtract 5km of wind at 1000 yards POI will be right or left up to 12" my 6.5 PRC and 7mm PRC not so much but you still have to read the wind and it's not always the same out at 1000 yards as it is at the gun which just adds to the equation, but dam it's fun.