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Rifles, Reloading, Optics, Equipment
Reloading
How to determine best distance from lands
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<blockquote data-quote="woods" data-source="post: 306608" data-attributes="member: 6042"><p>IMO you are still a decimal place off. Certainly it is OK to start at .005" off the lands but you will not see any significant change in group size when moving only .002" at a time unless you do a LOT of shooting. A more normal change in seating depth when looking for a seating depth would be .02" at a time. For instance .005" off, then .025" off, .045" off etc. Or at least vary it by .01" at a time.</p><p></p><p>Many bullets, especially the Barnes copper bullets, need to be started at .05" off and never get closer than .03" off. You will have a hard time regulating the seating depth to have a variance of less than .005" from bullet to bullet, much less .002".</p><p></p><p>IME when you get closer to the lands than .02" then you need to get absolute control of seating depth by consistant inside neck dimensions and bullet grip and by using a very good competition seater. I have yet to find a rifle where you could not find a good load by starting at .02" off and then finding the powder and powder weight the rifle prefers. Some rifles like Weatherby's and RUM's can be very accurate even when seated .275" off the lands.</p></blockquote><p></p>
[QUOTE="woods, post: 306608, member: 6042"] IMO you are still a decimal place off. Certainly it is OK to start at .005" off the lands but you will not see any significant change in group size when moving only .002" at a time unless you do a LOT of shooting. A more normal change in seating depth when looking for a seating depth would be .02" at a time. For instance .005" off, then .025" off, .045" off etc. Or at least vary it by .01" at a time. Many bullets, especially the Barnes copper bullets, need to be started at .05" off and never get closer than .03" off. You will have a hard time regulating the seating depth to have a variance of less than .005" from bullet to bullet, much less .002". IME when you get closer to the lands than .02" then you need to get absolute control of seating depth by consistant inside neck dimensions and bullet grip and by using a very good competition seater. I have yet to find a rifle where you could not find a good load by starting at .02" off and then finding the powder and powder weight the rifle prefers. Some rifles like Weatherby's and RUM's can be very accurate even when seated .275" off the lands. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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How to determine best distance from lands
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