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Are you using digital or dial calipers when checking you COL? Have they ever been calibrated and checked for accuracy? I work for a large company and I have all my tools calibrated once a year, its required. Are you sure the bullet you're seating is being set to the proper depth? Bullets can vary on the seating depth (COL) because of the design. .010 of an inch can mean a lot depending on your rifle, you could be hitting the lands or be right next to them.
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