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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chrony Question
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<blockquote data-quote="SBruce" data-source="post: 422571" data-attributes="member: 21068"><p>My opinion...........it takes at least ten shots of any given load to get enough data for a GOOD average, especially if you want to know SD's.</p><p> </p><p>If it's for drop charts or turrets either one, it would probably benefit you to try and do your chronoing under similar conditions you intend on using that load. Example: if the .223 is going to be used in the winter, then chrony it during the winter. If you're loads are subject to being left in the truck overnight during the winter, then put them in the freezer before you chrony, average barometer reading, ect, ect.</p><p> </p><p>Don't forget to measure exactly how far the crony is from the muzzle so you can let them know that too (TRUE muzzle velocity, not 15 or 20' away). Let them know the altitude where you did the shooting, but more importantly; let them know the AVERAGE altitude where you plan on using the turrets. </p><p> </p><p>Barometer, Temperature and Altitude have a bigger effect than alot of folks realize. <strong>Especially</strong> with relatively low BC bullets and slow velocity calibers. The bullets you mention in the .22's are pretty low BC, and the .223 is relatively slow.</p><p> </p><p>Good Luck!!</p></blockquote><p></p>
[QUOTE="SBruce, post: 422571, member: 21068"] My opinion...........it takes at least ten shots of any given load to get enough data for a GOOD average, especially if you want to know SD's. If it's for drop charts or turrets either one, it would probably benefit you to try and do your chronoing under similar conditions you intend on using that load. Example: if the .223 is going to be used in the winter, then chrony it during the winter. If you're loads are subject to being left in the truck overnight during the winter, then put them in the freezer before you chrony, average barometer reading, ect, ect. Don't forget to measure exactly how far the crony is from the muzzle so you can let them know that too (TRUE muzzle velocity, not 15 or 20' away). Let them know the altitude where you did the shooting, but more importantly; let them know the AVERAGE altitude where you plan on using the turrets. Barometer, Temperature and Altitude have a bigger effect than alot of folks realize. [B]Especially[/B] with relatively low BC bullets and slow velocity calibers. The bullets you mention in the .22's are pretty low BC, and the .223 is relatively slow. Good Luck!! [/QUOTE]
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