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Hunting
The Basics, Starting Out
Group Size and MOA
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<blockquote data-quote="Varmint Hunter" data-source="post: 56011" data-attributes="member: 313"><p>Groups are always calculated for center of bullet hole to center of bullet hole. This way a group fired from a .224 cartridge can be fairly compared to a group fired from a .338 cartridge (or any other). Measuring the outside edges of the farthest bullet holes and subtracting the bullet diameter is just the most common way of determining the center to center measurement.</p><p></p><p>For informal measuraments you can easily lay a dial caliper across the two farthest bullet hole centers by eye and you won't have to bother with the math. Its fast and easy for comparing your various group sizes.</p><p></p><p>Using a 5 shot group for measuring is the norm but some guys prefer 3 shots with the magnum cartridges because they get hot quickly and this can lead to rapid throat erosion. Generally speaking, 5 shot groups give you a much better idea of a loads consistency. It is easy to be fooled by an occasional good 3 shot group that may not really be a consistent performer.</p><p></p><p>Then there are the guys who shoot sub .25" groups with there box stock deer rifles. Some of these guys shoot half a box of ammo but only measure the 2 closest bullet holes. All the other shots are chalked up to "I must have pulled that one". <img src="http://images/icons/grin.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://images/icons/rolleyes.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>VH</p><p></p><p>[ 08-25-2004: Message edited by: Varmint Hunter ]</p></blockquote><p></p>
[QUOTE="Varmint Hunter, post: 56011, member: 313"] Groups are always calculated for center of bullet hole to center of bullet hole. This way a group fired from a .224 cartridge can be fairly compared to a group fired from a .338 cartridge (or any other). Measuring the outside edges of the farthest bullet holes and subtracting the bullet diameter is just the most common way of determining the center to center measurement. For informal measuraments you can easily lay a dial caliper across the two farthest bullet hole centers by eye and you won't have to bother with the math. Its fast and easy for comparing your various group sizes. Using a 5 shot group for measuring is the norm but some guys prefer 3 shots with the magnum cartridges because they get hot quickly and this can lead to rapid throat erosion. Generally speaking, 5 shot groups give you a much better idea of a loads consistency. It is easy to be fooled by an occasional good 3 shot group that may not really be a consistent performer. Then there are the guys who shoot sub .25" groups with there box stock deer rifles. Some of these guys shoot half a box of ammo but only measure the 2 closest bullet holes. All the other shots are chalked up to "I must have pulled that one". [img]images/icons/grin.gif[/img] [img]images/icons/rolleyes.gif[/img] [img]images/icons/grin.gif[/img] VH [ 08-25-2004: Message edited by: Varmint Hunter ] [/QUOTE]
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The Basics, Starting Out
Group Size and MOA
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