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Rifles, Reloading, Optics, Equipment
Reloading
Question about a load development method ....
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<blockquote data-quote="Veteran" data-source="post: 3082917" data-attributes="member: 118038"><p>I believe that velocity is important in load development. That's why you hear about velocity nodes, and everything you do to vary powder charge, and bullet seating, etc. all correlate to velocity. I think velocity is important because of system and barrel harmonics. It all correlates to harmonics and the way some authors and scientists have approached this is using bullet exit time in milli seconds from the barrel.</p><p></p><p>The goal in finding a perfect load is to find the combination of bullet seating, powder charge, neck tension etc. that produces a velocity at which the harmonics of the system result in the muzzle of the barrel at time of bullet exit pointing in an identical direction. That results in small groups.</p><p></p><p>The way I approach this is using the Chris Long white paper, estimate for a given load the bullet exit time or range of times.</p><p></p><p>Then, using Quickload, calculate bullet exit time for a number of seating, and powder charge combos.</p><p></p><p>Then back into the velocity range that gives that same bullet exit time range in Quickload, </p><p></p><p>That gets you into the ballpark without wasting a lot of components. Then do the actual shooting using bullet seating, powder charge, primer selection,</p><p>shoot ladders, or OCW, or plot velocity nodes from Satterlee, </p><p>to home in on your tight groups.</p><p></p><p>But I do believe its velocity related due to harmonics and finding the combination of factors that result in consistent muzzle pointing positionat the time of bullet exit</p><p>which is by proxy a function of bullet exit timing, however you get there.</p></blockquote><p></p>
[QUOTE="Veteran, post: 3082917, member: 118038"] I believe that velocity is important in load development. That's why you hear about velocity nodes, and everything you do to vary powder charge, and bullet seating, etc. all correlate to velocity. I think velocity is important because of system and barrel harmonics. It all correlates to harmonics and the way some authors and scientists have approached this is using bullet exit time in milli seconds from the barrel. The goal in finding a perfect load is to find the combination of bullet seating, powder charge, neck tension etc. that produces a velocity at which the harmonics of the system result in the muzzle of the barrel at time of bullet exit pointing in an identical direction. That results in small groups. The way I approach this is using the Chris Long white paper, estimate for a given load the bullet exit time or range of times. Then, using Quickload, calculate bullet exit time for a number of seating, and powder charge combos. Then back into the velocity range that gives that same bullet exit time range in Quickload, That gets you into the ballpark without wasting a lot of components. Then do the actual shooting using bullet seating, powder charge, primer selection, shoot ladders, or OCW, or plot velocity nodes from Satterlee, to home in on your tight groups. But I do believe its velocity related due to harmonics and finding the combination of factors that result in consistent muzzle pointing positionat the time of bullet exit which is by proxy a function of bullet exit timing, however you get there. [/QUOTE]
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Reloading
Question about a load development method ....
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