Cast
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You use all or one of the above ways to figure out how long it has to be for the bullet to be touching the lands. From there you begin testing new loads for that particular gun. Start at maybe .050 off the lands and try several loads varying the powder charge slightly. Once you find your best load you can try different seating depths to move the bullet closer to the lands and/or further away from the lands using you best load. Keep your targets and log your data. Pretty soon you will see a trend and you're a reloader!
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