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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Weird Error In Ballistic Calculation
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<blockquote data-quote="WiscGunner" data-source="post: 1751215" data-attributes="member: 97288"><p>Thank you for the extra information. It sounds like you have pretty accurately set up your system.</p><p></p><p>The one thing I would strongly suggest you do is forget you ever heard of Angle Compensated Range, this has no use outside a classroom. This will add hidden error to your system for no reason. Angle Compensated Range only affects elevation corrections in a vacuum. The big downside of this is that the bullet is still traveling the entire distance through environmentals even if on paper says it has a shorter path. It is basically a lie that deceives the truth of bullet flight.</p><p></p><p>Did you get these environmentals onsite (Kestrel or WeatherFlow) or from a nearby weather station? It is best to get them on site as actual data as there can be significant differences from the nearest weather tower.</p><p></p><p>What was the humidity? When figuring Density Altitude (how thick the air is) for ballistics it is important to have all 3 (Air Pressure, Temperature, Relative Humidity). I really like BallisticARC (free/14.99PRO) with a WeatherFlow weather meter ($80). Simple system with reliable data and easy inputs in the field including shot angle wind/shot bearing.</p><p></p><p>A 100yrd zero will give you an actual zero with almost no added variable of weather. Then, with your accurate velocity for that days temperature, you can start to dial in the BC of the factory bullet (on a flat range with little to no wind) as it actually performs in your rifle. This is affected by , bore (size, finish), muzzle turbulence (brake, crown, suppressor), chamber concentrically and velocity and will continue to change as velocity changes hence the increasing use of banded BC's.</p><p></p><p>Then you will have proper data to start determining what the terrain environmentals are adding to you equation.</p><p></p><p>What direction was the 5-10mph wind blowing? This can affect elevation even on a flat range depending upon the direction related to the shooter (12:00-ish, 6:00-ish). </p><p></p><p>Adding in steep terrain and a canyon you will have compounding issues. Wind is generally faster higher off the ground so crossing a depression can many times have fast wind than is registering on vegetation or at the shooter height. Then you have the wind direction against the terrain that can result in up-drafts/down-drafts. Then lastly you have temperature changes from cool air in the morning warming and rising toward afternoon to warm afternoon air cooling and sinking in the evening. The heating and cooling air creates thermal updrafts and down draft over the terrain. </p><p></p><p>Hope something in here was mildly helpful.</p></blockquote><p></p>
[QUOTE="WiscGunner, post: 1751215, member: 97288"] Thank you for the extra information. It sounds like you have pretty accurately set up your system. The one thing I would strongly suggest you do is forget you ever heard of Angle Compensated Range, this has no use outside a classroom. This will add hidden error to your system for no reason. Angle Compensated Range only affects elevation corrections in a vacuum. The big downside of this is that the bullet is still traveling the entire distance through environmentals even if on paper says it has a shorter path. It is basically a lie that deceives the truth of bullet flight. Did you get these environmentals onsite (Kestrel or WeatherFlow) or from a nearby weather station? It is best to get them on site as actual data as there can be significant differences from the nearest weather tower. What was the humidity? When figuring Density Altitude (how thick the air is) for ballistics it is important to have all 3 (Air Pressure, Temperature, Relative Humidity). I really like BallisticARC (free/14.99PRO) with a WeatherFlow weather meter ($80). Simple system with reliable data and easy inputs in the field including shot angle wind/shot bearing. A 100yrd zero will give you an actual zero with almost no added variable of weather. Then, with your accurate velocity for that days temperature, you can start to dial in the BC of the factory bullet (on a flat range with little to no wind) as it actually performs in your rifle. This is affected by , bore (size, finish), muzzle turbulence (brake, crown, suppressor), chamber concentrically and velocity and will continue to change as velocity changes hence the increasing use of banded BC's. Then you will have proper data to start determining what the terrain environmentals are adding to you equation. What direction was the 5-10mph wind blowing? This can affect elevation even on a flat range depending upon the direction related to the shooter (12:00-ish, 6:00-ish). Adding in steep terrain and a canyon you will have compounding issues. Wind is generally faster higher off the ground so crossing a depression can many times have fast wind than is registering on vegetation or at the shooter height. Then you have the wind direction against the terrain that can result in up-drafts/down-drafts. Then lastly you have temperature changes from cool air in the morning warming and rising toward afternoon to warm afternoon air cooling and sinking in the evening. The heating and cooling air creates thermal updrafts and down draft over the terrain. Hope something in here was mildly helpful. [/QUOTE]
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Weird Error In Ballistic Calculation
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