Can you elaborate? I have read very good reports on the .260 Remington during Army testing in a large gas platform. On the other hand, the 6.5 CM had numerous ammo issues, and had to have a great deal of tuning between gas port size, ammo load parameters and buffer weight. I am reading and observing from a distance, but the 6.5 CM seems to be a very finicky round in a direct impingement setup, while superb in a bolt gun.