Load Specifications
Load data in caliber 10.3 x 60 R Swiss with .416 | 400gr | A-Square LionLoad bullet and 19 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Hodgdon Hybrid 100V and Winchester 6.5 StaBALL.
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 4064 | <<locked>> | 82% | 34,592 psi | 88% | 1988 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 82% | 34,751 psi | 89% | 1959 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 33,779 psi | 86% | 1975 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 88% | 35,375 psi | 90% | 2077 fps | 97.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 32,111 psi | 82% | 2014 fps | 96.1% |
| Bofors RP3 | <<locked>> | 84% | 35,317 psi | 90% | 2018 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 34,650 psi | 88% | 2011 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,737 psi | 89% | 1316 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 35,259 psi | 90% | 2024 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,128 psi | 90% | 1348 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 33,170 psi | 85% | 2041 fps | 99% |
| Rottweil R 903 | <<locked>> | 86% | 35,375 psi | 90% | 2014 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 34,418 psi | 88% | 2014 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 34,330 psi | 88% | 1903 fps | 99.9% |
| Somchem S355 | <<locked>> | 84% | 34,316 psi | 88% | 1978 fps | 97.4% |
| Somchem S365 | <<locked>> | 94% | 33,605 psi | 86% | 2051 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 86% | 34,708 psi | 89% | 1969 fps | 98.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 33,721 psi | 86% | 2070 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 33,301 psi | 85% | 1955 fps | 96.8% |
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 4064 | <<locked>> | 80% | 32,387 psi | 83% | 1949 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 32,721 psi | 84% | 1919 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,618 psi | 81% | 1932 fps | 97% |
| Alliant Reloder-17 | <<locked>> | 84% | 31,082 psi | 79% | 1985 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 30,226 psi | 77% | 1969 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 30,879 psi | 79% | 1932 fps | 96.9% |
| Hodgdon Hybrid 100V | 62.5 gr | 88% | 29,022 psi | 74% | 1893 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,889 psi | 66% | 1175 fps | 100% |
| Ramshot Big Game | <<locked>> | 80% | 32,967 psi | 84% | 1978 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,165 psi | 67% | 1204 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,254 psi | 75% | 1949 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 80% | 29,225 psi | 75% | 1893 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 30,327 psi | 77% | 1929 fps | 95.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,271 psi | 82% | 1867 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 30,298 psi | 77% | 1900 fps | 96.1% |
| Somchem S365 | 62.8 gr | 86% | 26,368 psi | 67% | 1883 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 28,718 psi | 73% | 1854 fps | 97% |
| Vihtavuori N555 | <<locked>> | 98% | 31,749 psi | 81% | 2031 fps | 95.3% |
| Winchester 6.5 StaBALL | 66.3 gr | 84% | 29,312 psi | 75% | 1870 fps | 95.1% |
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 42 powders for 10.3 x 60 R Swiss loaded with the .416 | 400gr | A-Square LionLoad. Alliant Reloder-26 delivers the highest muzzle velocity at 2,113 fps; across all powders the maximum-charge window runs from 1,316 fps to 2,113 fps. Accurate 3100 gives the best case fill at 100 %, and 42 of the 42 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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. Somchem S365, Hodgdon Hybrid 100V, Winchester 6.5 StaBALL rank at the top here: for 10.3 x 60 R Swiss with the .416 | 400gr | A-Square LionLoad they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, Hodgdon H380 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.