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Rifles, Reloading, Optics, Equipment
Reloading
Problem with deviation on my handloads
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<blockquote data-quote="Bart B" data-source="post: 651548" data-attributes="member: 5302"><p>With a 150 fps SD, muzzle velocity spread's about 450 fps. Is the SD (standard deviation) indicated as much as you mention? Total spread's about 3 times the standard deviation.</p><p></p><p>I think your chronograph's a rubber ruler; it's probably not measuring consistantly. Case shape and its resizing issues have nothing to do with muzzle velocity. Neck tension does, but as long as it's got no more than a 20% spread in the release force needed to get the bullet out, that's fine.</p></blockquote><p></p>
[QUOTE="Bart B, post: 651548, member: 5302"] With a 150 fps SD, muzzle velocity spread's about 450 fps. Is the SD (standard deviation) indicated as much as you mention? Total spread's about 3 times the standard deviation. I think your chronograph's a rubber ruler; it's probably not measuring consistantly. Case shape and its resizing issues have nothing to do with muzzle velocity. Neck tension does, but as long as it's got no more than a 20% spread in the release force needed to get the bullet out, that's fine. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Problem with deviation on my handloads
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