CaliberAtlas › Accuracy
Source audit: July 12, 2026. Modeled results refreshed: September 5, 2026; publisher values are unchanged. We tested our G1 trajectory engine against manufacturer-published drop tables using the published muzzle velocity, BC, and zero, plus a 1.5-inch sight height, 59°F, sea-level pressure and 50% relative humidity as declared assumptions. Across 8 supersonic centerfire loads from Federal, Hornady, Remington, and Winchester (BC .314–.646), predicted drop matches the published tables within 0.31 MOA at every published distance and 0.12 MOA at 500 yards. The engine uses the standard published G1/G7 drag tables with a purely physical drag scale — no fitted corrections — so every table here is an out-of-sample test. The one rimfire load in this published audit, CCI Mini-Mag .22 LR 40gr, differs from CCI's table by at most 0.08 MOA across the published drop rows through 75 yards and by at most 4 fps across retained-velocity rows through 100 yards. That single-load result is not a universal rimfire accuracy bound. Note that manufacturer tables are themselves calculated from chronographed velocities and published BCs — this comparison proves our solver agrees with the industry references; your rifle will still differ from any table, which is what the range card builder's DOPE truing is for.
2650 fps · G1 BC 0.462 · 200 yd zero · source: federalpremium.com GM308M
| Range | Published drop | Our prediction | Deviation | Velocity (pub / ours) |
|---|---|---|---|---|
| 100 yd | +2.1" | +2.1" | +0.03 MOA | 2460 / 2457 |
| 300 yd | -8.9" | -8.9" | +0.01 MOA | 2103 / 2096 |
| 400 yd | -25.5" | -25.7" | -0.05 MOA | — |
| 500 yd | -51.5" | -51.9" | -0.07 MOA | 1778 / 1768 |
2650 fps · G1 BC 0.462 · 100 yd zero · source: federalpremium.com GM308M
| Range | Published drop | Our prediction | Deviation | Velocity (pub / ours) |
|---|---|---|---|---|
| 200 yd | -4.3" | -4.3" | +0.01 MOA | — |
| 300 yd | -15.3" | -15.3" | +0.00 MOA | — |
2700 fps · G1 BC 0.523 · 200 yd zero · source: hornady.com 80966
| Range | Published drop | Our prediction | Deviation | Velocity (pub / ours) |
|---|---|---|---|---|
| 100 yd | +2" | +2.0" | -0.02 MOA | 2530 / 2527 |
| 300 yd | -8.2" | -8.2" | -0.01 MOA | 2209 / 2201 |
| 400 yd | -23.5" | -23.6" | -0.03 MOA | — |
| 500 yd | -47.1" | -47.3" | -0.05 MOA | 1912 / 1901 |
2710 fps · G1 BC 0.646 · 200 yd zero · source: hornady.com 81500
| Range | Published drop | Our prediction | Deviation | Velocity (pub / ours) |
|---|---|---|---|---|
| 100 yd | +1.9" | +1.9" | -0.01 MOA | 2564 / 2569 |
| 300 yd | -7.8" | -7.8" | +0.01 MOA | 2285 / 2301 |
| 400 yd | -22.3" | -22.1" | +0.05 MOA | — |
| 500 yd | -44.4" | -43.8" | +0.11 MOA | 2023 / 2049 |
2700 fps · G1 BC 0.385 · 200 yd zero · source: federalpremium.com 3006B
| Range | Published drop | Our prediction | Deviation | Velocity (pub / ours) |
|---|---|---|---|---|
| 100 yd | +2.1" | +2.1" | +0.01 MOA | 2470 / 2467 |
| 300 yd | -9" | -9.0" | -0.01 MOA | 2045 / 2036 |
| 400 yd | -26.2" | -26.5" | -0.07 MOA | — |
| 500 yd | -54" | -54.2" | -0.05 MOA | 1667 / 1655 |
2910 fps · G1 BC 0.314 · 200 yd zero · source: remington.com R30061
| Range | Published drop | Our prediction | Deviation | Velocity (pub / ours) |
|---|---|---|---|---|
| 100 yd | +1.8" | +1.8" | +0.01 MOA | 2617 / 2613 |
| 300 yd | -8.2" | -8.2" | -0.01 MOA | 2083 / 2073 |
| 400 yd | -24.3" | -24.6" | -0.07 MOA | — |
| 500 yd | -51.2" | -51.4" | -0.04 MOA | 1622 / 1607 |
3060 fps · G1 BC 0.372 · 200 yd zero · source: Winchester Super-X catalog
| Range | Published drop | Our prediction | Deviation | Velocity (pub / ours) |
|---|---|---|---|---|
| 100 yd | +1.8" | +1.5" | -0.31 MOA | 2802 / 2799 |
| 300 yd | -7.1" | -6.8" | +0.09 MOA | 2329 / 2320 |
| 400 yd | -20.6" | -20.1" | +0.11 MOA | — |
| 500 yd | -42" | -41.4" | +0.12 MOA | 1904 / 1891 |
2975 fps · G1 BC 0.631 · 200 yd zero · source: hornady.com 80636
| Range | Published drop | Our prediction | Deviation | Velocity (pub / ours) |
|---|---|---|---|---|
| 100 yd | +1.4" | +1.4" | +0.03 MOA | 2827 / 2822 |
| 300 yd | -6.3" | -6.3" | +0.00 MOA | 2542 / 2532 |
| 400 yd | -17.9" | -18.0" | -0.03 MOA | — |
| 500 yd | -35.6" | -35.8" | -0.04 MOA | 2274 / 2260 |
1235 fps · BC 0.13 (evaluated as G1) · 100 yd zero · source: cci-ammunition.com Target Mini-Mag Part #30
| Range | Published drop | Our prediction | Deviation | Velocity (pub / ours) |
|---|---|---|---|---|
| 25 yd | +1.5" | +1.5" | +0.08 MOA | — |
| 50 yd | +2.9" | +2.9" | +0.00 MOA | 1092 / 1089 |
| 75 yd | +2.4" | +2.5" | +0.08 MOA | 1040 / 1037 |
| 100 yd | — | — | — | 998 / 994 |
Applied Ballistics measured ballistic coefficients using flight timing. Its Berger 155-grain VLD Table 2 reports calculated trajectories using those coefficients, rather than measured 1,000-yard impacts. Our comparison uses a 100-yard zero and 1.5-inch sight height; those two source conditions were not independently recovered. This is a numerical reference check with declared assumptions, not a field-accuracy guarantee.
Source: Ballistic Coefficient Testing of the Berger .308 155 grain VLD, Table 2, page 6. Source values, fixture assumptions, and tolerances are recorded separately.
With G7 BC .228 and 3,000 fps, our reference case differs from the published calculation at 1,000 yards by 0.30 inches of drop, 0.36 inches of wind drift, 0 fps of rounded retained velocity, and 0.001 seconds of flight time. Agreement between calculations does not establish that precision for a particular rifle. Confirm modeled results with observed data; transonic predictions remain estimates.
The calculator, extended-ballistics view, and range card use G7 when the selected load supplies a G7 coefficient. The model badge identifies the calculation used; stored reference tables remain G1 calculations.
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