Load Specifications
Load data in caliber 10.3 x 60 R Swiss with .416 | 350gr | Impala RNFP KO bullet and 18 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate 4064, SNPE Vectan Tubal 5000 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 2495 | <<locked>> | 88% | 35,389 psi | 90% | 2037 fps | 99.8% |
| Accurate 2520 | <<locked>> | 82% | 34,563 psi | 88% | 2021 fps | 97% |
| Accurate 4064 | <<locked>> | 90% | 35,244 psi | 90% | 2054 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 82% | 33,518 psi | 86% | 2014 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 34,809 psi | 89% | 2044 fps | 95.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,939 psi | 87% | 1319 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 34,011 psi | 87% | 2041 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 86% | 35,288 psi | 90% | 2047 fps | 97.2% |
| Norma 202 | <<locked>> | 84% | 34,606 psi | 88% | 2008 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,142 psi | 87% | 1352 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 86% | 35,288 psi | 90% | 2047 fps | 97.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 35,070 psi | 90% | 1936 fps | 97.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 33,852 psi | 86% | 1939 fps | 98.3% |
| Somchem S335 | <<locked>> | 82% | 34,389 psi | 88% | 1942 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 82% | 34,635 psi | 88% | 1942 fps | 99.4% |
| Vihtavuori N135 | <<locked>> | 88% | 35,404 psi | 90% | 2031 fps | 99.7% |
| Vihtavuori N140 | <<locked>> | 86% | 34,679 psi | 89% | 1991 fps | 98% |
| Vihtavuori N540 | <<locked>> | 86% | 33,402 psi | 85% | 1985 fps | 97.1% |
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 2495 | <<locked>> | 80% | 28,079 psi | 72% | 1893 fps | 98.6% |
| Accurate 2520 | <<locked>> | 80% | 32,416 psi | 83% | 1982 fps | 96.3% |
| Accurate 4064 | 47.8 gr | 80% | 26,629 psi | 68% | 1870 fps | 95.4% |
| Alliant AR-Comp | <<locked>> | 80% | 31,589 psi | 81% | 1978 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 32,793 psi | 84% | 2001 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,367 psi | 65% | 1178 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 30,414 psi | 78% | 1962 fps | 98.2% |
| Lovex D073.6 | <<locked>> | 80% | 29,399 psi | 75% | 1926 fps | 95.1% |
| Norma 202 | <<locked>> | 80% | 30,864 psi | 79% | 1929 fps | 96.5% |
| ReloadSwiss RS 14 | 16.8 gr | 80% | 25,483 psi | 65% | 1207 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 29,399 psi | 75% | 1926 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,040 psi | 84% | 1896 fps | 97% |
| SNPE Vectan Tubal 5000 | 46.2 gr | 80% | 27,050 psi | 69% | 1795 fps | 96% |
| Somchem S335 | <<locked>> | 80% | 32,590 psi | 83% | 1906 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 80% | 32,619 psi | 83% | 1906 fps | 99.1% |
| Vihtavuori N135 | <<locked>> | 80% | 28,108 psi | 72% | 1883 fps | 98.4% |
| Vihtavuori N140 | <<locked>> | 80% | 29,283 psi | 75% | 1880 fps | 96.2% |
| Vihtavuori N540 | <<locked>> | 80% | 28,195 psi | 72% | 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 18 powders for 10.3 x 60 R Swiss loaded with the .416 | 350gr | Impala RNFP KO. Accurate 4064 delivers the highest muzzle velocity at 2,054 fps; across all powders the maximum-charge window runs from 1,319 fps to 2,054 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 18 of the 18 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 350.0 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. Accurate 4064, SNPE Vectan Tubal 5000, ReloadSwiss RS 14 rank at the top here: for 10.3 x 60 R Swiss with the .416 | 350gr | Impala RNFP KO they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.