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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need help choosing factory ammo for Kimber 270 wsm
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<blockquote data-quote="NATE40" data-source="post: 844748" data-attributes="member: 33416"><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">The chart was put out by Burris and according to their test data. The Ballistic Coefficient (BC) is determined by the velocity and the sectional density (SD) of the factory ammo they tested. BC is what determines trajectory and wind drift, other factors (velocity among them) being equal. BC changes with the shape of the bullet and the speed at which the bullet is traveling, while sectional density does not. Spitzer, which means pointed, is a more efficient shape than a round nose or a flat point. At the other end of the bullet, a boat tail (or tapered heel) reduces drag compared to a flat base. Both increase the BC of a bullet. The chart showed a high BC more streamlined "but" as the bullet slows down the SD (stays the same weight) can change the flight of the bullet and the BC . So the chart claims that this round may not perform as well when bullet really starts to slow down about 350 Yards and beyond. So using the chart as a guideline on choosing a factory hunting round you would avoid the highlighted rounds at first.</span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">try to find a round that is faster with a Higher BC matched to the load (not highlighted) use the chart for inputs a ballistic calculator (on this sites toolbar)find out your drop different ranges inches or moa or mils you can also factor in wind. Then purchase ammo and start shooting to see where they print once zeroed you will know where the path of your bullet at short and long distances and windage. The chart is useful for knowing what factory rounds are being produced and the ballistics @sea level and the change of the flight of the bullet to the elevation of the area your hunting</span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">Hope this helps</span></span></p></blockquote><p></p>
[QUOTE="NATE40, post: 844748, member: 33416"] [SIZE=3][FONT=Calibri]The chart was put out by Burris and according to their test data. The Ballistic Coefficient (BC) is determined by the velocity and the sectional density (SD) of the factory ammo they tested. BC is what determines trajectory and wind drift, other factors (velocity among them) being equal. BC changes with the shape of the bullet and the speed at which the bullet is traveling, while sectional density does not. Spitzer, which means pointed, is a more efficient shape than a round nose or a flat point. At the other end of the bullet, a boat tail (or tapered heel) reduces drag compared to a flat base. Both increase the BC of a bullet. The chart showed a high BC more streamlined “but” as the bullet slows down the SD (stays the same weight) can change the flight of the bullet and the BC . So the chart claims that this round may not perform as well when bullet really starts to slow down about 350 Yards and beyond. So using the chart as a guideline on choosing a factory hunting round you would avoid the highlighted rounds at first.[/FONT][/SIZE] [SIZE=3][FONT=Calibri]try to find a round that is faster with a Higher BC matched to the load (not highlighted) use the chart for inputs a ballistic calculator (on this sites toolbar)find out your drop different ranges inches or moa or mils you can also factor in wind. Then purchase ammo and start shooting to see where they print once zeroed you will know where the path of your bullet at short and long distances and windage. The chart is useful for knowing what factory rounds are being produced and the ballistics @sea level and the change of the flight of the bullet to the elevation of the area your hunting[/FONT][/SIZE] [SIZE=3][FONT=Calibri]Hope this helps[/FONT][/SIZE] [/QUOTE]
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Need help choosing factory ammo for Kimber 270 wsm
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