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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 PRC Ballistics - drops don’t match ballistics chart
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<blockquote data-quote="fiftybmg" data-source="post: 1743560" data-attributes="member: 96316"><p>You need to shoot and record.</p><p></p><p>All calculators are based on math, and the math is not complex enough to account for any physical firing condition. Therefore, the math is an approximation. It is a good approximation, but not perfect.</p><p></p><p>To get the actual drop at 500 yards, you need a paper target at 500 yards - shoot at it, and measure the drop off the paper.</p><p></p><p>The cardboard packaging that fridges [refrigerator], stoves and washing machines come in, make great long range targets. One side of the box is around one square yard, and colored insulation or duct tape makes a nice big cross visible at 500 yards in the scope. Fridge packaging makes for a good tall target backing when you need to check scope tracking.</p><p></p><p>[addendum]</p><p></p><p>The drop you measure on a given day will change with altitude, temperature and humidity. It's important to record the conditions, and if you take it seriously, repeat the test several times in the year. You then have at least one drop chart that reflects actual conditions on the day.</p></blockquote><p></p>
[QUOTE="fiftybmg, post: 1743560, member: 96316"] You need to shoot and record. All calculators are based on math, and the math is not complex enough to account for any physical firing condition. Therefore, the math is an approximation. It is a good approximation, but not perfect. To get the actual drop at 500 yards, you need a paper target at 500 yards - shoot at it, and measure the drop off the paper. The cardboard packaging that fridges [refrigerator], stoves and washing machines come in, make great long range targets. One side of the box is around one square yard, and colored insulation or duct tape makes a nice big cross visible at 500 yards in the scope. Fridge packaging makes for a good tall target backing when you need to check scope tracking. [addendum] The drop you measure on a given day will change with altitude, temperature and humidity. It's important to record the conditions, and if you take it seriously, repeat the test several times in the year. You then have at least one drop chart that reflects actual conditions on the day. [/QUOTE]
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6.5 PRC Ballistics - drops don’t match ballistics chart
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