I just bought a new Sendero 7mm mag about a month ago. I now have 150 rounds through it and have not found a load that will shoot better than 1". I have tried three different bullets and five powders. I'm not sure what is causing my problems. I am finding brass shavings on the bolt face and the base of the cases are somewhat scarred up. The brass is Norma so it is not just cheap brass. Some cases are hard to work in the action especially after neck sizing (I'm not shooting hot loads and there a absolutely no pressure signs). None of the fired cases are hard to eject though. I also had some dummy snap caps to practice with and try the trigger after adjustments and the gun also scarred up these cases around the base. If anyone has any idea what the problem is and what my options are please let me know.