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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Question About "Group Size"
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<blockquote data-quote="Dave King" data-source="post: 22368" data-attributes="member: 3"><p>EDITED: Looks like you got two answers at the same time.</p><p></p><p></p><p>If I understand what you're asking then this is the answer.</p><p></p><p>If I shoot a .243 bullet through a target and then measure the hole it should be .243 (+-). I then measure the distance across this same hole and subtract one caliber diameter and that's the group size .243 - .243 = 0 (no one shot groups are ever anything but 0 in size).</p><p></p><p>If I have a .308 caliber that shoots to one ragged hole with 3 or 5 shots, I also then measure across the hole and subtract .308. If the hole is .355 across and the caliber is .308 the group is .047 (.355 - .308 = .047).</p><p></p><p>What were doing in measuring these groups is determining the distance from the exact center of the first hole that the furthest bullets' exact center deviated.</p><p></p><p>Don't think of the entire hole of the first shot (hole), think only of the exact center of this hole, an infinitely small speck in the exact center.</p><p></p><p>Remember, a one shot group has 0 deviation and therefore it's a group of 0 size.</p><p></p><p>[ 04-17-2002: Message edited by: Dave King ]</p></blockquote><p></p>
[QUOTE="Dave King, post: 22368, member: 3"] EDITED: Looks like you got two answers at the same time. If I understand what you're asking then this is the answer. If I shoot a .243 bullet through a target and then measure the hole it should be .243 (+-). I then measure the distance across this same hole and subtract one caliber diameter and that's the group size .243 - .243 = 0 (no one shot groups are ever anything but 0 in size). If I have a .308 caliber that shoots to one ragged hole with 3 or 5 shots, I also then measure across the hole and subtract .308. If the hole is .355 across and the caliber is .308 the group is .047 (.355 - .308 = .047). What were doing in measuring these groups is determining the distance from the exact center of the first hole that the furthest bullets' exact center deviated. Don't think of the entire hole of the first shot (hole), think only of the exact center of this hole, an infinitely small speck in the exact center. Remember, a one shot group has 0 deviation and therefore it's a group of 0 size. [ 04-17-2002: Message edited by: Dave King ] [/QUOTE]
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Question About "Group Size"
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