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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Ballistic calculator issues
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<blockquote data-quote="TopPin" data-source="post: 2930741" data-attributes="member: 109070"><p>So posted BC is just Posted… if you're confident in your scope height and your velocity, there is only a handful of other variables in the equation. Temp, air density, wind, elevation, consistency of load work up, factory or hand loads, SD and ES ext. I do not rely on posted BC. It is based off an average of barrel length, velocity, powder charge ext. Typically sea level elevation. Barrel twist, velocity, elevation all play a role in your ballistics being correct. I personally do not true my ballistics inside of 800 yards. 650 on most ballistic calculators is very close after 650 you start to see what I refer to as the parachute effect on projectiles. Adjusted BC or velocity values will true your Drop chart. The effects on doing this are very minimal if any inside of 650. If your scope is tracking properly, then you need to adjust the BC value of your ballistic calculator to correspond with what your true dope is on your scope. Trust what you see, not what a computer tells you.</p></blockquote><p></p>
[QUOTE="TopPin, post: 2930741, member: 109070"] So posted BC is just Posted… if you’re confident in your scope height and your velocity, there is only a handful of other variables in the equation. Temp, air density, wind, elevation, consistency of load work up, factory or hand loads, SD and ES ext. I do not rely on posted BC. It is based off an average of barrel length, velocity, powder charge ext. Typically sea level elevation. Barrel twist, velocity, elevation all play a role in your ballistics being correct. I personally do not true my ballistics inside of 800 yards. 650 on most ballistic calculators is very close after 650 you start to see what I refer to as the parachute effect on projectiles. Adjusted BC or velocity values will true your Drop chart. The effects on doing this are very minimal if any inside of 650. If your scope is tracking properly, then you need to adjust the BC value of your ballistic calculator to correspond with what your true dope is on your scope. Trust what you see, not what a computer tells you. [/QUOTE]
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Ballistic calculator issues
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