Oliveralan
Well-Known Member
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
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
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