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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chrono accuracy
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<blockquote data-quote="Trickymissfit" data-source="post: 535733" data-attributes="member: 25383"><p>Not picking a side or anything with the 17HMR, but I would tell you this. The only way to accurately base a testing number is to use three identical pieces of equipment (or more) to build a base number off of (that's the way labs test stuff). Assuming the 2550fps is an accurate figure, I would use it as a base figure. Then I would simply try several under the exact same conditions (sameday and about the same time of day). Try to shoot everything out of the barrel with a temp fairly close. In otherwords a cold barrel or a warm barrel. I would expect to see as much as a 12fps difference between each unit you test out, cause they are different. And who knows which is actually dead on the money. If I were testing chronographs, I would use something like a 6PPC or a .222 Remington. Use one single case and a lot of bullets that were all weighed prior to loading. Try to make each load as exactly the same as possible. The otherway to do this is to actually measure the case volume in grains of water they hold, but then you have to deal with slight external differences in the neck and shoulders.</p><p>good luck</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 535733, member: 25383"] Not picking a side or anything with the 17HMR, but I would tell you this. The only way to accurately base a testing number is to use three identical pieces of equipment (or more) to build a base number off of (that's the way labs test stuff). Assuming the 2550fps is an accurate figure, I would use it as a base figure. Then I would simply try several under the exact same conditions (sameday and about the same time of day). Try to shoot everything out of the barrel with a temp fairly close. In otherwords a cold barrel or a warm barrel. I would expect to see as much as a 12fps difference between each unit you test out, cause they are different. And who knows which is actually dead on the money. If I were testing chronographs, I would use something like a 6PPC or a .222 Remington. Use one single case and a lot of bullets that were all weighed prior to loading. Try to make each load as exactly the same as possible. The otherway to do this is to actually measure the case volume in grains of water they hold, but then you have to deal with slight external differences in the neck and shoulders. good luck gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chrono accuracy
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