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Rifles, Reloading, Optics, Equipment
Reloading
Absolute best scale.
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<blockquote data-quote="Bart B" data-source="post: 1162143" data-attributes="member: 5302"><p>There's a greater spread in primer output for a given lot of them than a 1/10th grain (.1) of powder causes. And that's ten times the spread of 1/100th grain (.01) grain of powder. Some powders have 3 to 6 granules per 1/10th grain of weight, so how does one measure to the nearest .01 grain if that covers 3 granules: cut one in thirds or fourths?</p><p></p><p>To say nothing of the variables humans have that influence the accuracy of a given load that's 10 times bigger than what those powder charge variables cause. For example, several people shooting the same rifle and ammo will have a muzzle velocity average somewhere in a 100 fps range. If they're hand holding the rifle against their shoulder, the muzzle velocity will be slower and the spread will be 3 to 4 times that the barreled action will have clamped solid in a vice so it doesn't move at all. Newton's laws prevail.</p><p></p><p>Sierra Bullets throws charges direct from measures that have a spread of 2/10ths grain or more. Their best match bullets shoot 1/4 MOA 10-shot groups in their 200 yard range. They don't work up new loads for different lots of components nor for a new test barrel; the recipie that worked well with the old stuff does as well as the new stuff.</p><p></p><p>It doesn't matter if a beam scale is 2/10ths grain off exact. As long as it's repeatable to 1/10th grain, that's good enough. There's typically a grain or two difference across powder lots to produce the same exact pressure with a given load in a given barrel anyway.</p><p></p><p>Having bullet diameters at least .0003" larger in diameter than the barrel's groove diameter is 10 times more important thatn exact charge weights.</p><p></p><p>But it's easy to see errors in charge weight. Much more so than the other elements of accuracy that are not considered that have a much greater impact. How many of you who've watched a benchrest match notice the people shooting do not hold onto their rifles? They're fired in free recoil untouched by humans except for a finger on their 2-ounce trigger. Rifles shoot much more accurate when they're not held by a human against their shoulder; rested on bags or not.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1162143, member: 5302"] There's a greater spread in primer output for a given lot of them than a 1/10th grain (.1) of powder causes. And that's ten times the spread of 1/100th grain (.01) grain of powder. Some powders have 3 to 6 granules per 1/10th grain of weight, so how does one measure to the nearest .01 grain if that covers 3 granules: cut one in thirds or fourths? To say nothing of the variables humans have that influence the accuracy of a given load that's 10 times bigger than what those powder charge variables cause. For example, several people shooting the same rifle and ammo will have a muzzle velocity average somewhere in a 100 fps range. If they're hand holding the rifle against their shoulder, the muzzle velocity will be slower and the spread will be 3 to 4 times that the barreled action will have clamped solid in a vice so it doesn't move at all. Newton's laws prevail. Sierra Bullets throws charges direct from measures that have a spread of 2/10ths grain or more. Their best match bullets shoot 1/4 MOA 10-shot groups in their 200 yard range. They don't work up new loads for different lots of components nor for a new test barrel; the recipie that worked well with the old stuff does as well as the new stuff. It doesn't matter if a beam scale is 2/10ths grain off exact. As long as it's repeatable to 1/10th grain, that's good enough. There's typically a grain or two difference across powder lots to produce the same exact pressure with a given load in a given barrel anyway. Having bullet diameters at least .0003" larger in diameter than the barrel's groove diameter is 10 times more important thatn exact charge weights. But it's easy to see errors in charge weight. Much more so than the other elements of accuracy that are not considered that have a much greater impact. How many of you who've watched a benchrest match notice the people shooting do not hold onto their rifles? They're fired in free recoil untouched by humans except for a finger on their 2-ounce trigger. Rifles shoot much more accurate when they're not held by a human against their shoulder; rested on bags or not. [/QUOTE]
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Absolute best scale.
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