Load Specifications
Load data in caliber 10.3 x 60 R Swiss with .416 | 300gr | Barnes X S bullet and 14 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Accurate 2495 and Vihtavuori N135.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 33,504 psi | 86% | 2119 fps | 98.3% |
| Accurate 2495 | <<locked>> | 92% | 35,418 psi | 90% | 2231 fps | 99.1% |
| Accurate 4064 | <<locked>> | 94% | 35,317 psi | 90% | 2244 fps | 96.9% |
| Alliant AR-Comp | <<locked>> | 86% | 34,214 psi | 87% | 2215 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,286 psi | 85% | 1437 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 34,737 psi | 89% | 2234 fps | 98% |
| Norma 202 | <<locked>> | 88% | 35,273 psi | 90% | 2198 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,344 psi | 85% | 1473 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 34,055 psi | 87% | 2087 fps | 95.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 34,635 psi | 88% | 2123 fps | 97% |
| Somchem S335 | <<locked>> | 86% | 35,346 psi | 90% | 2136 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 84% | 33,576 psi | 86% | 2100 fps | 98.2% |
| Vihtavuori N135 | <<locked>> | 90% | 33,794 psi | 86% | 2185 fps | 98.6% |
| Vihtavuori N140 | <<locked>> | 88% | 33,446 psi | 85% | 2139 fps | 95.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 31,560 psi | 81% | 2077 fps | 97.8% |
| Accurate 2495 | 49.8 gr | 80% | 25,092 psi | 64% | 1991 fps | 95.9% |
| Accurate 4064 | <<locked>> | 90% | 31,488 psi | 80% | 2162 fps | 95.6% |
| Alliant AR-Comp | <<locked>> | 80% | 28,834 psi | 74% | 2090 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,772 psi | 63% | 1283 fps | 100% |
| IMR 3031 | 49.1 gr | 80% | 27,673 psi | 71% | 2060 fps | 95.2% |
| Norma 202 | <<locked>> | 86% | 33,330 psi | 85% | 2159 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,976 psi | 64% | 1319 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 32,285 psi | 82% | 2047 fps | 95% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 29,399 psi | 75% | 2008 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 29,994 psi | 77% | 2021 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 30,037 psi | 77% | 2021 fps | 97.1% |
| Vihtavuori N135 | 48.1 gr | 80% | 25,657 psi | 66% | 1985 fps | 95.7% |
| Vihtavuori N140 | <<locked>> | 86% | 31,720 psi | 81% | 2103 fps | 95.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 40 powders for 10.3 x 60 R Swiss loaded with the .416 | 300gr | Barnes X S. Accurate 4064 delivers the highest muzzle velocity at 2,244 fps; across all powders the maximum-charge window runs from 1,437 fps to 2,244 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 40 of the 40 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 85–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.416" calls for a 1:21.0 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. IMR 3031, Accurate 2495, Vihtavuori N135 rank at the top here: for 10.3 x 60 R Swiss with the .416 | 300gr | Barnes X S they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI Benchmark 8208, Alliant Reloder- TS 15.5, Bofors RP3 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.