In our match this past Saturday we had 22- 6.5's and 7- 6's. The 30's have fallen out of competition favor mainly due to how they fight the wind. Wind and your ability to read and correct for it is probably the biggest challenge that separates shooters. Many of the various competitions/leagues set velocity restrictions to deal with the potential for damage to match targets. The reality is though that the high energy calibers are impractical for this type of shooting as the recoil makes follow up shots more difficult and in matches that can run from 50 to over 100 rounds those calibers would just beat down someone trying to shot them. Recoil management is the primary reason that people are looking at 6mm to start with.
Have heard those 6.5s ability to buck wind is borderline fu**ing magical. I'm still fond of the 260 so perhaps its time I jump on the wagon.
As fot socom and dhs switching.. I dont think you'll see a whole lot of price drop as they wont be producing "range fodder" in 6.5. If its for socom and dhs snipers.. Likely it'll be some pretty damn good ammo with the civilian population getting the "X" imperfect ammunition which will still command a premium, much like xm855 did for so long (which i still don't understand why)