Could it be the guy you used to beat has just gotten better? The 115 DTACs have an even lower BC than the 105 hybrids and a lower velocity. The .260 should be able to shoot inside the 6's by about 3 inches at 850 yards and alomost 5.5" at 1000 with shooter skill and wind reading skills being equal. Even with the .260 slowed down to 2700 fps the windage numbers are within an inch or less past 800 with the 6.5 having the slight advantage. I have noticed the 6mm's have been getting more and more popular and for good reason as they really are providing some outstanding performance but I personally just haven't seen where they are providing an advantage over my .260 just yet. But...I haven't been beat by a hot rod 6mm yet here locally so I suppose I could change my tune as well if that starts to happen.