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A good micrometer seating die is a help. I use Redding Competition seaters which adjust to 1 thou. Also good to set your die so that the press cams over a touch, which gives consistent seating depth....

It can make a big difference.

If you load up a batch and seat 5 projectiles at 10, 20, 30, 40 etc thou off the lands you will see big differences on paper over the range of seating depths.

Best...