Interesting footnote from the 2011 Shooter's Bash match held at Rifles Only.
The article was in the August 2012 issue of Guns Magazine. Shooter’s Bash 2011, A Tactical Match at Rifles Only
by Jacob Gottfriedson
Out of the top 10 finishers:
3 were shooting the .243 Win (1st, 9th & 10th)
4 were shooting the .260 Rem, (2nd through 5th places)
1 was shooting 6mm Creedmoor (6th)
1 was shooting 300WM (7th)
1 was shooting 7mm WSM (8th)
I've also heard/read that the .260 is very popular at silhouette matches.