T 700,
I shoot in a varmint silhouette competition where the 6mmBR, 6mmDasher, and 6x47 are all used. The targets are from 200 to 600 yards. I have used the 6mmBR and the 6x47, and won with both. My experience is that the slower bullet with less recoil from a heavy rifle will be the most accurate, so the 6mmBR is inherently the most accurate when the wind isn't blowing. Unfortunately the wind blows here and pushes the slower bullets off target more than the faster bullets. I have a very heavy rifle, so I can use the 6x47 and not pay a penalty for the increased recoil, and it is noticeably more, but in a normal weight rifle, the Dasher is the best compromise and is what most competitors use.
I shoot in a varmint silhouette competition where the 6mmBR, 6mmDasher, and 6x47 are all used. The targets are from 200 to 600 yards. I have used the 6mmBR and the 6x47, and won with both. My experience is that the slower bullet with less recoil from a heavy rifle will be the most accurate, so the 6mmBR is inherently the most accurate when the wind isn't blowing. Unfortunately the wind blows here and pushes the slower bullets off target more than the faster bullets. I have a very heavy rifle, so I can use the 6x47 and not pay a penalty for the increased recoil, and it is noticeably more, but in a normal weight rifle, the Dasher is the best compromise and is what most competitors use.