What am I Missing 6.5x284

Dialed in my groups by playing with seating depth. Tried .010, .020, .025, .028, .030, and they were random 3/8"-1/2" and occasionally better. Jumped to .050 and bingo! Tried .053, .056, .047, .044 and they were about .300". Back to .050 and repeatable under .250"… adjusted scope zero… done!
Great job in do so!
 
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