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Rifles, Reloading, Optics, Equipment
Reloading
Seating depth question!
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<blockquote data-quote="Canadian Bushman" data-source="post: 1017006" data-attributes="member: 41122"><p>+1 yup</p><p></p><p>A coarse seating depth test with a mild charge will tell you where your bullet likes to be shot from before you work up a powder charge. </p><p></p><p>I favor the bullet close to the lands, ive always found better accuracy and e.s. with the bullet somewhere between .03 jump and -.01 jam. I always shoot vld bullets with secant ogives as well.</p><p></p><p>When im working with a rifle thats like the bullet close to the lands i usually start .01 off ( or wherever my initial seating test suggested) and find a powder charge, then move the bullet around .005-.010 to shape the grouping. Typically moving into the lands at this point will raise pressure and moving away will reduce it. Never have conducting seating test with these small increments shown unpredictably high pressure. If you pay attention to your brass and speeds its very easy and safe conducting seating test in this manner. </p><p></p><p>If you are using a load on the upper end and conducting seating test with large increments you are asking for trouble. If you have to change your seating by more than +/- .02 - .03 you are no longer shaping your grouping, you are changing the load and need to reconsider the decisions that lead you to this point.</p></blockquote><p></p>
[QUOTE="Canadian Bushman, post: 1017006, member: 41122"] +1 yup A coarse seating depth test with a mild charge will tell you where your bullet likes to be shot from before you work up a powder charge. I favor the bullet close to the lands, ive always found better accuracy and e.s. with the bullet somewhere between .03 jump and -.01 jam. I always shoot vld bullets with secant ogives as well. When im working with a rifle thats like the bullet close to the lands i usually start .01 off ( or wherever my initial seating test suggested) and find a powder charge, then move the bullet around .005-.010 to shape the grouping. Typically moving into the lands at this point will raise pressure and moving away will reduce it. Never have conducting seating test with these small increments shown unpredictably high pressure. If you pay attention to your brass and speeds its very easy and safe conducting seating test in this manner. If you are using a load on the upper end and conducting seating test with large increments you are asking for trouble. If you have to change your seating by more than +/- .02 - .03 you are no longer shaping your grouping, you are changing the load and need to reconsider the decisions that lead you to this point. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Seating depth question!
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