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The Basics, Starting Out
Measuring group size.
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<blockquote data-quote="Ray Meketa" data-source="post: 56290" data-attributes="member: 2778"><p>Back in the good old days it was easy to measure group size. You simply measured the distance between the center of the two widest shots. Today, many groups are one ragged hole and it's impossible to identify individual shots much less the center of the two that are farthest apart. So, what you do is measure the outside of the group at it's widest or biggest point and subtract the diameter of the bullet. For example, you shoot a 30 caliber group that measures .679 at it's biggest point. .679 minus .308 will give you, hmmm lets see, 8 from 9 is 1, carry the 3, two decimals over, oh hell just use your pocket calculator and the group size comes to .371. In benchrest parlance this would be called a Big 3 and would be a very good group regardless of caliber. You don't really need a calculator unless you're ignorant like me but you probably will need a caliper that will measure in Thousandths of an inch. <img src="http://images/icons/grin.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://images/icons/grin.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>[ 10-28-2004: Message edited by: Cheechako ]</p><p></p><p>[ 10-28-2004: Message edited by: Cheechako ]</p></blockquote><p></p>
[QUOTE="Ray Meketa, post: 56290, member: 2778"] Back in the good old days it was easy to measure group size. You simply measured the distance between the center of the two widest shots. Today, many groups are one ragged hole and it's impossible to identify individual shots much less the center of the two that are farthest apart. So, what you do is measure the outside of the group at it's widest or biggest point and subtract the diameter of the bullet. For example, you shoot a 30 caliber group that measures .679 at it's biggest point. .679 minus .308 will give you, hmmm lets see, 8 from 9 is 1, carry the 3, two decimals over, oh hell just use your pocket calculator and the group size comes to .371. In benchrest parlance this would be called a Big 3 and would be a very good group regardless of caliber. You don't really need a calculator unless you're ignorant like me but you probably will need a caliper that will measure in Thousandths of an inch. [img]images/icons/grin.gif[/img] [img]images/icons/grin.gif[/img] [ 10-28-2004: Message edited by: Cheechako ] [ 10-28-2004: Message edited by: Cheechako ] [/QUOTE]
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The Basics, Starting Out
Measuring group size.
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