Well I shot my 300wsm at 100, 300, and 511yds today along with my 6.5x47L at 100yds and 511yds. It went pretty well. I shot 100 and 300 from my bench and shot 511 off the bipod from the back of my truck. I was a bit uncomfortable shooting the 300wsm and I'm sure that's why the group was 3 3/4" but I got it figured out and shot a 2 1/8" 5 shot group with my 6.5x47L. I ran out of white paint so I had to use grey which didn't give a very good contrast at 511yds. I had a really good 2 shot group at 300yds and then pulled the 3rd right about 1 1/4".