I have an 18" SPR that I've been really wanting to push past 400m as of late, but thats about my failure point for kentucky windage/holdovers.
I've got a nice nightforce 2.5-10x32 sitting on top of it in an LT104, and it will put 10 rounds in about .7" if I do my part at 100m.
I've been shooting 69 grain black hills blue box through it, and it is currently zeroed at 100m. When that dries up, I will be switching to MK262.
I do not have a chrono, so I have no way of knowing exactly what the velocity is, nor do I know anything else to really calculate the drop, but atleast its a common barrel length, and a common load.
Can someone help me create a drop chart for this combination? Even if it got me close, I'd be happy!
I would google that same load and barrel and find your fps. Then find your b.c. for that bullet. You can go to
midway to find that. .301 BTW Measure your scope to center bore. Punch it all in useing
JBM's ballisticIf you have a smart phone, down load an AP and it will use current weather and other information.
Anyone have another ballistic calculator? That was asking me to install some download manager which I'd rather not do.
Originally Posted By ARsR4ME:
Did you find your fps
I think its going to be pretty close to 2700 fps....haven't found specifics, but that seems to be reasonable.
Trajectory
Input Data
Manufacturer: Sierra Description: MatchKing™ (Litz)
Caliber: 0.224 in Weight: 69.0 gr
Bullet Length (Library): 0.900 in
Muzzle Velocity: 2700.0 ft/s Distance to Chronograph: 10.0 ft
Sight Height: 1.50 in Sight Offset: 0.00 in
Zero Height: 0.00 in Zero Offset: 0.00 in
Windage: 0.000 MOA Elevation: 0.000 MOA
Line Of Sight Angle: 0.0 deg Cant Angle: 0.0 deg
Barrel Twist: 7.0 in Twist Direction: Right
Wind Speed: 10.0 mph Wind Angle: 90.0 deg
Target Speed: 10.0 mph Target Angle: 90.0 deg
Target Height: 12.0 in
Temperature: 59.0 °F Pressure: 29.92 in Hg
Humidity: 0.0 % Altitude: 0.0 ft
Vital Zone Radius: 5.0 in
Std. Atmosphere at Altitude: No Pressure is Corrected: Yes
Zero at Max. Point Blank Range: No Target Relative Drops: Yes
Mark Sound Barrier Crossing: No Include Extra Rows: No
Column 1 Units: 1.00 in Column 2 Units: 1.00 MOA
Round Output to Whole Numbers: No
Output Data
Elevation: 3.856 MOA Windage: 0.000 MOA
Atmospheric Density: 0.07647 lb/ft³ Speed of Sound: 1116.4 ft/s
Maximum PBR: 314 yd Maximum PBR Zero: 268 yd
Range of Maximum Height: 149 yd Energy at Maximum PBR: 566.3 ft•lbs
Sectional Density: 0.196 lb/in² Stability at Muzzle: 2.705
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 *** 2709.1 2.427 1124.3 0.000 0.0 ***
100 -0.0 -0.0 1.1 1.1 2442.0 2.187 913.5 0.117 20.5 19.6
200 -4.4 -2.1 4.8 2.3 2190.4 1.962 735.0 0.246 43.4 20.7
300 -16.0 -5.1 11.3 3.6 1954.6 1.751 585.2 0.391 68.9 21.9
400 -36.8 -8.8 21.3 5.1 1732.3 1.552 459.7 0.554 97.6 23.3
500 -69.2 -13.2 35.5 6.8 1521.7 1.363 354.7 0.739 130.1 24.8
600 -116.8 -18.6 54.8 8.7 1323.4 1.185 268.3 0.951 167.3 26.6
700 -184.3 -25.1 80.6 11.0 1141.5 1.022 199.6 1.195 210.3 28.7
800 -278.5 -33.2 113.3 13.5 1034.6 0.927 164.0 1.473 259.3 31.0
900 -405.1 -43.0 150.4 16.0 979.3 0.877 146.9 1.772 311.9 33.1
1000 -568.0 -54.2 191.0 18.2 932.9 0.836 133.3 2.086 367.2 35.1
Try this link to JBM
You shouldn't have to download anything. I just threw some standard numbers in there as a basic but the more info you can put the better it will be for ya. And you can print this out on his website and make card from it
Originally Posted By Marksman14:
Anyone have another ballistic calculator? That was asking me to install some download manager which I'd rather not do.
This is the one I use when I make my drop charts.
Hornady Ballistics Calculator
I like that one because it gives me MOA settings.
For offline PC calculations I downloaded this one.
Berger Ballistics Program
They are bare bones calculators, easy to use and just the ticket for your application.
You'll need to know the velocity and bullet's ballistic coefficient.
I usually can find the bullet at MidwayUSA.com to get the ballistic coefficient.
