So far Ive sorted my once fired Win. brass by weight,(within 2gr.). Trimmed to length, neck turned to .012", uniformed and deburred primer pockets, neck size only and annealed. The powder is carefully scaled and the Sierra MK 220gr. bullets are soft seated. My extreme spread is just under 30fps which I dont think is acceptable. The primers are Fed. bench rest. Al I can think of now is go to match quality brass. Who is a good supplier of this for the 300 win mag?