Load Specifications
Load data in caliber 10.3 x 60 R Swiss with .416 | 270gr | Impala LW CFN bullet and 12 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate 2495, Vihtavuori N135 and ReloadSwiss RS 14.
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>> | 84% | 34,330 psi | 88% | 2280 fps | 97.8% |
| Accurate 2495 | <<locked>> | 92% | 34,113 psi | 87% | 2349 fps | 98.2% |
| Alliant AR-Comp | <<locked>> | 88% | 35,143 psi | 90% | 2379 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 35,143 psi | 90% | 2329 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,054 psi | 84% | 1542 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 33,620 psi | 86% | 2352 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,054 psi | 84% | 1578 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 33,678 psi | 86% | 2238 fps | 95.7% |
| Somchem S335 | <<locked>> | 86% | 34,243 psi | 87% | 2251 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 82% | 35,360 psi | 90% | 2260 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 86% | 34,432 psi | 88% | 2257 fps | 97.7% |
| Vihtavuori N135 | <<locked>> | 92% | 34,505 psi | 88% | 2339 fps | 98.1% |
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% | 30,661 psi | 78% | 2195 fps | 96.7% |
| Accurate 2495 | 54.1 gr | 82% | 25,527 psi | 65% | 2136 fps | 95.1% |
| Alliant AR-Comp | <<locked>> | 80% | 27,992 psi | 71% | 2201 fps | 98.2% |
| Hodgdon H322 | <<locked>> | 80% | 33,156 psi | 85% | 2283 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,714 psi | 63% | 1378 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 30,008 psi | 77% | 2260 fps | 95.2% |
| ReloadSwiss RS 14 | 18.5 gr | 80% | 24,656 psi | 63% | 1411 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 31,966 psi | 82% | 2198 fps | 95.1% |
| Somchem S335 | <<locked>> | 84% | 32,416 psi | 83% | 2208 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 33,359 psi | 85% | 2218 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 80% | 29,153 psi | 74% | 2133 fps | 95.9% |
| Vihtavuori N135 | 53.5 gr | 84% | 27,673 psi | 71% | 2172 fps | 95.6% |
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 38 powders for 10.3 x 60 R Swiss loaded with the .416 | 270gr | Impala LW CFN. Alliant AR-Comp delivers the highest muzzle velocity at 2,379 fps; across all powders the maximum-charge window runs from 1,542 fps to 2,379 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 38 of the 38 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 84–90 %, leaving at least 10 % headroom. 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. Accurate 2495, Vihtavuori N135, ReloadSwiss RS 14 rank at the top here: for 10.3 x 60 R Swiss with the .416 | 270gr | Impala LW CFN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2460, Accurate 2520, ADI Benchmark 8208 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.