Reloading some 6.5 creedmoor. A few rounds seem to have problems in the case gauge but they chamber in my rifle just like the others. No extra force to close the bolt. But a few are extremely tight in a case gauge. Some I forced down into the gauge and got them to go in pain to get out without damaging the tip but got them out. All the same brand brass with the same loading process. All was once fired. I ended up shooting them and had great groups with no signs of extra pressure. Reloaded some more and have the same issues with a few of them. Out of 25 rounds loaded 6 of them have this same problem. The 2nd time I reloaded some I started over and took my dies apart and set them all back up. What could be the cause of this for only part of them to be different.