How accurate must the 100 yard zero be to make hits out to 1000 yards? Is it plus or minus 1 yard, 1 foot, 6 inches? Where to I measure from? I have read from the end of the barrel and other have said from the turrets of the scope.
How accurate must the 100 yard zero be to make hits out to 1000 yards? Is it plus or minus 1 yard, 1 foot, 6 inches? Where to I measure from? I have read from the end of the barrel and other have said from the turrets of the scope.
I'm using a 223 AR-15 , 20" barrel with 69 gr and 77 gr SMK, looking to hit an IPSIC torso plate 600 to 1000 yards. I have my muzzle velocity (69 gr at 2925fps, 77 gr at 2810), using a chrono. I'm just wondering if I input 100 yards as the zero, but it is really 95 yards, how much will that change the data?A perfect no wind zero at 100 is ideal. You need to know your ammo specs bullet weight and velocity to give you your come ups at 1000. JBM is great for that.
Once you find out your come up for 1000, you need to see how much elevation you have available on your scope. Depending on bullet weight and velocity you will need 32"-36" of elevation at 1000, or you are going to have to play with hold overs.
Theoretically, if you can hold 1" at 100 you can hold 10" at 1000. Normally at Butner we could put a new shooter on target on a fairly calm day in 3-6 shots.
Trajectory | |||
Input Data | |||
Manufacturer: | Sierra | Description: | MatchKing |
Caliber: | 0.224 in | Weight: | 69.0 gr |
Ballistic Coefficient: | 0.169 G7 (ICAO) | ||
Muzzle Velocity: | 2925.0 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 |
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 % | 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: | 3.458 MOA | Windage: | 0.000 MOA |
Atmospheric Density: | 0.07647 lb/ft³ | Speed of Sound: | 1116.4 ft/s |
Maximum PBR: | 338 yd | Maximum PBR Zero: | 288 yd |
Range of Maximum Height: | 161 yd | Energy at Maximum PBR: | 645.6 ft•lbs |
Sectional Density: | 0.196 lb/in² |
(yd) | (in) | (MOA) | (in) | (MOA) | (ft/s) | (none) | (ft•lbs) | (s) | (in) | (MOA) |
---|---|---|---|---|---|---|---|---|---|---|
Range | Drop | Drop | Windage | Windage | Velocity | Mach | Energy | Time | Lead | Lead |
Calculated Table | ||||||||||
0 | -1.5 | *** | 0.0 | *** | 2934.5 | 2.628 | 1319.1 | 0.000 | 0.0 | *** |
100 | -0.0 | -0.0 | 0.9 | 0.9 | 2655.8 | 2.379 | 1080.4 | 0.107 | 18.9 | 18.1 |
200 | -3.5 | -1.7 | 3.9 | 1.9 | 2391.6 | 2.142 | 876.2 | 0.227 | 39.9 | 19.0 |
300 | -13.1 | -4.2 | 9.2 | 2.9 | 2143.2 | 1.920 | 703.6 | 0.359 | 63.2 | 20.1 |
400 | -30.3 | -7.2 | 17.3 | 4.1 | 1910.2 | 1.711 | 559.0 | 0.507 | 89.3 | 21.3 |
500 | -57.1 | -10.9 | 28.7 | 5.5 | 1690.2 | 1.514 | 437.6 | 0.674 | 118.7 | 22.7 |
600 | -96.1 | -15.3 | 44.1 | 7.0 | 1481.9 | 1.327 | 336.4 | 0.864 | 152.0 | 24.2 |
700 | -151.1 | -20.6 | 64.3 | 8.8 | 1286.3 | 1.152 | 253.5 | 1.081 | 190.3 | 26.0 |
800 | -227.2 | -27.1 | 90.6 | 10.8 | 1110.2 | 0.994 | 188.8 | 1.333 | 234.5 | 28.0 |
900 | -331.3 | -35.2 | 122.5 | 13.0 | 1022.6 | 0.916 | 160.2 | 1.616 | 284.4 | 30.2 |
1000 | -468.6 | -44.7 | 157.6 | 15.0 | 969.8 | 0.869 | 144.1 | 1.918 | 337.5 | 32.2 |
Trajectory | |||
Input Data | |||
Manufacturer: | Sierra | Description: | HPBT MatchKing™ |
Caliber: | 0.224 in | Weight: | 77.0 gr |
Ballistic Coefficients: | 0.343 [0-1800], 0.362 [1800-2500], 0.362 [2500-5000] G1 (ASM) | ||
Muzzle Velocity: | 2925.0 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 |
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 % | 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: | 3.453 MOA | Windage: | 0.000 MOA |
Atmospheric Density: | 0.07647 lb/ft³ | Speed of Sound: | 1116.4 ft/s |
Maximum PBR: | 340 yd | Maximum PBR Zero: | 290 yd |
Range of Maximum Height: | 162 yd | Energy at Maximum PBR: | 746.8 ft•lbs |
Sectional Density: | 0.219 lb/in² |
(yd) | (in) | (MOA) | (in) | (MOA) | (ft/s) | (none) | (ft•lbs) | (s) | (in) | (MOA) |
---|---|---|---|---|---|---|---|---|---|---|
Range | Drop | Drop | Windage | Windage | Velocity | Mach | Energy | Time | Lead | Lead |
Calculated Table | ||||||||||
0 | -1.5 | *** | 0.0 | *** | 2934.1 | 2.628 | 1471.7 | 0.000 | 0.0 | *** |
100 | -0.0 | -0.0 | 0.9 | 0.8 | 2668.5 | 2.390 | 1217.3 | 0.107 | 18.9 | 18.0 |
200 | -3.5 | -1.7 | 3.7 | 1.8 | 2418.0 | 2.166 | 999.4 | 0.225 | 39.7 | 18.9 |
300 | -12.9 | -4.1 | 8.7 | 2.8 | 2181.2 | 1.954 | 813.3 | 0.356 | 62.7 | 19.9 |
400 | -29.6 | -7.1 | 16.2 | 3.9 | 1958.0 | 1.754 | 655.3 | 0.501 | 88.2 | 21.1 |
500 | -55.5 | -10.6 | 26.8 | 5.1 | 1746.8 | 1.565 | 521.6 | 0.663 | 116.7 | 22.3 |
600 | -92.8 | -14.8 | 40.9 | 6.5 | 1545.8 | 1.385 | 408.5 | 0.846 | 148.9 | 23.7 |
700 | -144.7 | -19.7 | 59.3 | 8.1 | 1368.3 | 1.226 | 320.1 | 1.052 | 185.2 | 25.3 |
800 | -215.2 | -25.7 | 82.2 | 9.8 | 1219.9 | 1.093 | 254.4 | 1.285 | 226.2 | 27.0 |
900 | -309.2 | -32.8 | 109.8 | 11.6 | 1106.3 | 0.991 | 209.2 | 1.544 | 271.7 | 28.8 |
1000 | -431.5 | -41.2 | 141.5 | 13.5 | 1025.0 | 0.918 | 179.6 | 1.826 | 321.4 | 30.7 |
What happens if I tell the app my zero is 100 yards, but in realty it is only 95 yards?If you use an app like Strelok you can enter all your data and play with a 95yd zero or 100yd zero and set your adjustments accordingly.
Im kinda trying to follow along. What do you mean by “true data” and “true bc”? Thx.You’ll need to true your data at 600 for mv and then true the bc at 1000. The zero difference won’t matter much after truing.
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Why would you lie to your app?What happens if I tell the app my zero is 100 yards, but in realty it is only 95 yards?
“Truing” your data is essentially confirming at each distance, then changing your inputs until your calculatorIm kinda trying to follow along. What do you mean by “true data” and “true bc”? Thx.
Trying to teach a man to fish...@AR10ShooterinNC , nobody seems to have actually proposed an answer to your actual question....
Measure the zero from muzzle to target. But, for practical purposes, the ~16-24” from chamber to muzzle won’t matter much.