Load Specifications
Load data in caliber 10.3 x 60 R Swiss with .410 | 210gr | Sierra Sports Master bullet and 11 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, ReloadSwiss RS 14 and Hodgdon TrailBoss.
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>> | 92% | 34,896 psi | 89% | 2707 fps | 96.5% |
| Accurate 2495ᴾ | <<locked>> | 100% | 32,793 psi | 84% | 2736 fps | 96.4% |
| Alliant AR-Comp | <<locked>> | 94% | 34,548 psi | 88% | 2782 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 33,518 psi | 86% | 2690 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,734 psi | 78% | 1818 fps | 100% |
| IMR 4198 | <<locked>> | 84% | 34,171 psi | 87% | 2657 fps | 98.2% |
| Norma 200 | <<locked>> | 84% | 35,389 psi | 90% | 2726 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,429 psi | 78% | 1864 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 34,780 psi | 89% | 2661 fps | 97.4% |
| Vihtavuori N133 | <<locked>> | 92% | 34,127 psi | 87% | 2651 fps | 96% |
| Vihtavuori N135 | <<locked>> | 98% | 33,460 psi | 85% | 2723 fps | 96.2% |
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>> | 90% | 32,677 psi | 83% | 2651 fps | 95.8% |
| Accurate 2495 | <<locked>> | 98% | 30,487 psi | 78% | 2677 fps | 95.5% |
| Alliant AR-Comp | 66.3 gr | 86% | 26,600 psi | 68% | 2549 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 82% | 29,341 psi | 75% | 2579 fps | 95.7% |
| Hodgdon TrailBoss | 21.5 gr | 80% | 22,408 psi | 57% | 1627 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 30,153 psi | 77% | 2549 fps | 96.9% |
| Norma 200 | <<locked>> | 80% | 30,777 psi | 79% | 2608 fps | 97.2% |
| ReloadSwiss RS 14 | 21.9 gr | 80% | 22,017 psi | 56% | 1663 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 28,631 psi | 73% | 2500 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 90% | 32,024 psi | 82% | 2595 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 96% | 31,343 psi | 80% | 2667 fps | 95.4% |
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 33 powders for 10.3 x 60 R Swiss loaded with the .410 | 210gr | Sierra Sports Master. IMR 3031 delivers the highest muzzle velocity at 2,795 fps; across all powders the maximum-charge window runs from 1,818 fps to 2,795 fps. Accurate 2495 gives the best case fill at 100 %, and 33 of the 33 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 78–90 %, leaving at least 10 % headroom. Accurate 2495, Accurate 4064, Hodgdon TrailBoss 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. Alliant AR-Comp, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 10.3 x 60 R Swiss with the .410 | 210gr | Sierra Sports Master they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2460, Accurate 2520, Accurate 4064 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.