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With handloading and establishing a seating depth I have found that if you start with the bullet barely touching the rifling as a starting point you have established a baseline.From this point you move your seating die in .005 increments down or seat the bullet deeper in the case.If you start .020 or .030 off the rifling you will make adjustments in both directions.By starting at the rifling you are working in one direction.A bullet comparator and dial calipers will let you measure from the thickest part of the bullet to the case head.you can account for the differance in length of the specific bullet loaded.The bullet comparator duplicates your rifles throating for a more accurate measurement. Good luck with your reloading.


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