So i dialed up a cheap ballistic calculator app and punched in all the known variables for my .338lm i know the round is traveling at 3015 FPS with a 300gr projo that has a BC of .419 the calculator is telling me to expect a 370 inch drop at 1000 yards? does this seem correct? i only ask because thats only about 30inches less than my standard .308 at the same range....
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Ballisitc calculator readings?
- Thread starter nick89rs
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Re: Ballisitc calculator readings?
With that low a BC, that's about right. Sounds like a round nose soft point, and 3000 is pretty darn fast for a 300gr bullet from a 338LM.
With that low a BC, that's about right. Sounds like a round nose soft point, and 3000 is pretty darn fast for a 300gr bullet from a 338LM.
Re: Ballisitc calculator readings?
Ok , try this on .
G1 of 818 and mv of 2950....... 20.9 min @ 1K
Sound better ?
Greg
Ok , try this on .
G1 of 818 and mv of 2950....... 20.9 min @ 1K
Sound better ?
Greg
Re: Ballisitc calculator readings?
Using one of the popular calculators available on-line I get the following results. Note the drop of only 222.7 inches.
<span style="color: #3333FF">Trajectory (Simplified)
Input Data
Ballistic Coefficient: 0.419 G7 Caliber: 0.338 in
Bullet Weight: 300.0 gr
Muzzle Velocity: 3015.0 ft/s
Sight Height: 1.50 in Line Of Sight Angle: 0.0 deg
Cant Angle: 0.0 deg
Wind Speed: 0.0 mph Target Speed: 0.0 mph
Temperature: 59.0 °F Pressure: 29.92 in Hg
Humidity: 0.0 % Altitude: 0.0 ft
Std. Atmosphere at Altitude: No Pressure is Corrected: Yes
Zero at Max. Point Blank Range: No Target Relative Drops: Yes
Column 1 Units: 1.00 in Column 2 Units: 1.00 MOA
Round Output to Whole Numbers: No
Output Data
Elevation: 3.306 MOA Windage: 0.000 MOA
Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.4 ft/s
Maximum PBR: 383 yd Maximum PBR Zero: 324 yd
Range of Maximum Height: 176 yd Energy at Maximum PBR: 4448.6 ft•lbs
Sectional Density: 0.375 lb/in²
Calculated Table
Range Drop Drop Windage Windage Velocity Mach Energy Time Lead Lead
(yd) (in) (MOA) (in) (MOA) (ft/s) (none) (ft•lbs) (s) (in) (MOA)
0 -1.5 *** 0.0 *** 3015.0 2.701 6054.3 0.000 0.0 ***
100 -0.0 -0.0 0.0 0.0 2899.5 2.597 5599.3 0.101 0.0 0.0
200 -2.6 -1.3 0.0 0.0 2786.1 2.495 5169.9 0.207 0.0 0.0
300 -9.8 -3.1 0.0 0.0 2674.9 2.396 4765.6 0.317 0.0 0.0
400 -21.7 -5.2 0.0 0.0 2566.1 2.298 4385.8 0.431 0.0 0.0
500 -39.0 -7.4 0.0 0.0 2459.8 2.203 4029.9 0.551 0.0 0.0
600 -62.0 -9.9 0.0 0.0 2356.0 2.110 3696.9 0.675 0.0 0.0
700 -91.3 -12.4 0.0 0.0 2254.8 2.020 3386.0 0.806 0.0 0.0
800 -127.4 -15.2 0.0 0.0 2156.2 1.931 3096.4 0.942 0.0 0.0
900 -171.0 -18.1 0.0 0.0 2060.2 1.845 2826.9 1.084 0.0 0.0
1000 -222.7 -21.3 0.0 0.0 1966.6 1.762 2575.9 1.233 0.0 0.0 </span>
Using one of the popular calculators available on-line I get the following results. Note the drop of only 222.7 inches.
<span style="color: #3333FF">Trajectory (Simplified)
Input Data
Ballistic Coefficient: 0.419 G7 Caliber: 0.338 in
Bullet Weight: 300.0 gr
Muzzle Velocity: 3015.0 ft/s
Sight Height: 1.50 in Line Of Sight Angle: 0.0 deg
Cant Angle: 0.0 deg
Wind Speed: 0.0 mph Target Speed: 0.0 mph
Temperature: 59.0 °F Pressure: 29.92 in Hg
Humidity: 0.0 % Altitude: 0.0 ft
Std. Atmosphere at Altitude: No Pressure is Corrected: Yes
Zero at Max. Point Blank Range: No Target Relative Drops: Yes
Column 1 Units: 1.00 in Column 2 Units: 1.00 MOA
Round Output to Whole Numbers: No
Output Data
Elevation: 3.306 MOA Windage: 0.000 MOA
Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.4 ft/s
Maximum PBR: 383 yd Maximum PBR Zero: 324 yd
Range of Maximum Height: 176 yd Energy at Maximum PBR: 4448.6 ft•lbs
Sectional Density: 0.375 lb/in²
Calculated Table
Range Drop Drop Windage Windage Velocity Mach Energy Time Lead Lead
(yd) (in) (MOA) (in) (MOA) (ft/s) (none) (ft•lbs) (s) (in) (MOA)
0 -1.5 *** 0.0 *** 3015.0 2.701 6054.3 0.000 0.0 ***
100 -0.0 -0.0 0.0 0.0 2899.5 2.597 5599.3 0.101 0.0 0.0
200 -2.6 -1.3 0.0 0.0 2786.1 2.495 5169.9 0.207 0.0 0.0
300 -9.8 -3.1 0.0 0.0 2674.9 2.396 4765.6 0.317 0.0 0.0
400 -21.7 -5.2 0.0 0.0 2566.1 2.298 4385.8 0.431 0.0 0.0
500 -39.0 -7.4 0.0 0.0 2459.8 2.203 4029.9 0.551 0.0 0.0
600 -62.0 -9.9 0.0 0.0 2356.0 2.110 3696.9 0.675 0.0 0.0
700 -91.3 -12.4 0.0 0.0 2254.8 2.020 3386.0 0.806 0.0 0.0
800 -127.4 -15.2 0.0 0.0 2156.2 1.931 3096.4 0.942 0.0 0.0
900 -171.0 -18.1 0.0 0.0 2060.2 1.845 2826.9 1.084 0.0 0.0
1000 -222.7 -21.3 0.0 0.0 1966.6 1.762 2575.9 1.233 0.0 0.0 </span>
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