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Rifles, Reloading, Optics, Equipment
Reloading
Measuring lands help needed
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<blockquote data-quote="SBruce" data-source="post: 412937" data-attributes="member: 21068"><p>One important thing to remember:</p><p> </p><p><strong>Best or most accurate seating depth is different for every rifle/bullet combo</strong>.</p><p> </p><p>The method of measuring the lands is not nearly as important as getting a benchmark and varying the seating depths enough to find the best (most accurate) one................All methods work, but once we have a number to base off of, the seating depths should be varied in test loads. We will then shoot groups with those batches of varied depths and find out which is most accurate (Base to Ogive) with that particular rifle/bullet. Some sort of comparator will be used from that point on to set up the loaded round to the best Base to Ogive length.</p><p> </p><p>The RCBS Precision Mic is used to measure the Boltface to Lands, and then used to measure Base to Ogive. It is a very simple tool to use, not expensive and plenty capable of measuring your loaded rounds to .001 or less to ensure they are at the optimum depth. It can also be used later (as the throat wears) to measure how much barrel erosion has occured. If the throat has wore .010", then the Seating depth would be extended by .010" ect.</p><p> </p><p>Once again, everything is relative in this process. Most important thing is to find your most accurate seating depth and duplicate it for future loadings. As long as you stick with the same tool or method, the results can be repeated at any time.</p></blockquote><p></p>
[QUOTE="SBruce, post: 412937, member: 21068"] One important thing to remember: [B]Best or most accurate seating depth is different for every rifle/bullet combo[/B]. The method of measuring the lands is not nearly as important as getting a benchmark and varying the seating depths enough to find the best (most accurate) one................All methods work, but once we have a number to base off of, the seating depths should be varied in test loads. We will then shoot groups with those batches of varied depths and find out which is most accurate (Base to Ogive) with that particular rifle/bullet. Some sort of comparator will be used from that point on to set up the loaded round to the best Base to Ogive length. The RCBS Precision Mic is used to measure the Boltface to Lands, and then used to measure Base to Ogive. It is a very simple tool to use, not expensive and plenty capable of measuring your loaded rounds to .001 or less to ensure they are at the optimum depth. It can also be used later (as the throat wears) to measure how much barrel erosion has occured. If the throat has wore .010", then the Seating depth would be extended by .010" ect. Once again, everything is relative in this process. Most important thing is to find your most accurate seating depth and duplicate it for future loadings. As long as you stick with the same tool or method, the results can be repeated at any time. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Measuring lands help needed
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