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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need some help extrapolating my drop data.
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<blockquote data-quote="Oliveralan" data-source="post: 373397" data-attributes="member: 20245"><p>Hey,</p><p> </p><p>I have used exbal to work out some drop data, but i cant get the computed numbers to match my real world drops. Can someone who maybe has a better knowledge of ballistics chime in and/or use a more sophisticated program and edits BC? My velocity is right around 2844fps. I am shooting a 208gr A-max. published bc is .648 or .233 G7 according to Bryan's book (this is off memory dont take my word for it).</p><p> </p><p>Input parameters:</p><p>Temp: 55 degrees F</p><p>Pressure: 29.7</p><p>Altitude: 32ft over sea level</p><p>humidity: 78%</p><p>Velocity: 2844fps (measured with chrony, average over 5 shots, i know it's not much.)</p><p>Sight height: 1.64"</p><p>Zero: 100 yards</p><p> </p><p>Real world drops:</p><p>100yrds -- 0 moa</p><p>200yrds -- 2 moa</p><p>250yrds -- 2.75 moa</p><p>300yrds -- 3.5 moa <-- rock solid</p><p>370yrds -- 5.75 moa</p><p>400yrds -- 6 moa <-- rock solid</p><p></p><p>these are the drops I was using most were derived from reactive targets 3.5" in diameter so allow for a little variance. 300 and 400 yard drops were on steel and I adjsted till they hit perfect center line.</p><p> </p><p>I am thinking about just graphing my real world drops in excel or such and then extrapolating. Will see, i will measure drops in inches from 100 to 400 in 50yrd intervals next saturday.</p><p> </p><p>I am going to texas on a boar hunt next tuesday and am trying to get this stuff ready or ill waste a day of my hunt working up drop charts, instead of just a few hours confirming it.</p><p> </p><p>Thanks,</p><p>Oliver</p></blockquote><p></p>
[QUOTE="Oliveralan, post: 373397, member: 20245"] Hey, I have used exbal to work out some drop data, but i cant get the computed numbers to match my real world drops. Can someone who maybe has a better knowledge of ballistics chime in and/or use a more sophisticated program and edits BC? My velocity is right around 2844fps. I am shooting a 208gr A-max. published bc is .648 or .233 G7 according to Bryan's book (this is off memory dont take my word for it). Input parameters: Temp: 55 degrees F Pressure: 29.7 Altitude: 32ft over sea level humidity: 78% Velocity: 2844fps (measured with chrony, average over 5 shots, i know it's not much.) Sight height: 1.64" Zero: 100 yards Real world drops: 100yrds -- 0 moa 200yrds -- 2 moa 250yrds -- 2.75 moa 300yrds -- 3.5 moa <-- rock solid 370yrds -- 5.75 moa 400yrds -- 6 moa <-- rock solid these are the drops I was using most were derived from reactive targets 3.5" in diameter so allow for a little variance. 300 and 400 yard drops were on steel and I adjsted till they hit perfect center line. I am thinking about just graphing my real world drops in excel or such and then extrapolating. Will see, i will measure drops in inches from 100 to 400 in 50yrd intervals next saturday. I am going to texas on a boar hunt next tuesday and am trying to get this stuff ready or ill waste a day of my hunt working up drop charts, instead of just a few hours confirming it. Thanks, Oliver [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
Need some help extrapolating my drop data.
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