Load Specifications
Load data in caliber 10.3 x 60 R Swiss with .411 | 300gr | Hornady InterLock SP bullet and 21 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Accurate 4064 and Accurate 2495.
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% | 33,649 psi | 86% | 2198 fps | 99% |
| Accurate 2495 | <<locked>> | 90% | 33,591 psi | 86% | 2267 fps | 99.3% |
| Accurate 2520 | <<locked>> | 86% | 34,592 psi | 88% | 2290 fps | 96.4% |
| Accurate 2520 | <<locked>> | 86% | 34,592 psi | 88% | 2290 fps | 96.4% |
| Accurate 4064 | <<locked>> | 92% | 33,678 psi | 86% | 2287 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 86% | 35,041 psi | 89% | 2306 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 34,621 psi | 88% | 2254 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,040 psi | 84% | 1493 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 34,621 psi | 88% | 2313 fps | 98.8% |
| Lovex D073.6 | <<locked>> | 88% | 34,592 psi | 88% | 2290 fps | 96.4% |
| Norma 202 | <<locked>> | 86% | 34,026 psi | 87% | 2247 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,156 psi | 85% | 1529 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 33,721 psi | 86% | 2201 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 34,592 psi | 88% | 2290 fps | 96.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 34,461 psi | 88% | 2172 fps | 96.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 35,418 psi | 90% | 2215 fps | 98.2% |
| Somchem S335 | <<locked>> | 84% | 33,692 psi | 86% | 2178 fps | 97.6% |
| Vihtavuori N133 | <<locked>> | 84% | 34,185 psi | 87% | 2185 fps | 99% |
| Vihtavuori N135 | <<locked>> | 90% | 34,722 psi | 89% | 2274 fps | 99.4% |
| Vihtavuori N140 | <<locked>> | 88% | 34,374 psi | 88% | 2238 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 90% | 35,114 psi | 90% | 2267 fps | 97% |
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% | 31,705 psi | 81% | 2159 fps | 98.6% |
| Accurate 2495 | 55.8 gr | 80% | 24,134 psi | 62% | 2044 fps | 96.5% |
| Accurate 2520 | <<locked>> | 84% | 32,256 psi | 82% | 2241 fps | 95.5% |
| Accurate 2520 | <<locked>> | 84% | 32,256 psi | 82% | 2241 fps | 95.5% |
| Accurate 4064 | 60 gr | 86% | 27,789 psi | 71% | 2149 fps | 95.2% |
| Alliant AR-Comp | <<locked>> | 80% | 28,993 psi | 74% | 2172 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 80% | 32,474 psi | 83% | 2208 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,424 psi | 62% | 1332 fps | 100% |
| IMR 3031 | 53.3 gr | 80% | 25,512 psi | 65% | 2083 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 86% | 32,256 psi | 82% | 2241 fps | 95.5% |
| Norma 202 | <<locked>> | 82% | 29,965 psi | 77% | 2156 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,468 psi | 62% | 1365 fps | 100% |
| Rottweil R 901 | <<locked>> | 80% | 31,850 psi | 81% | 2156 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 32,256 psi | 82% | 2241 fps | 95.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 30,458 psi | 78% | 2087 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 27,847 psi | 71% | 2047 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 29,834 psi | 76% | 2093 fps | 96.3% |
| Vihtavuori N133 | <<locked>> | 80% | 30,226 psi | 77% | 2100 fps | 98.1% |
| Vihtavuori N135 | <<locked>> | 80% | 25,353 psi | 65% | 2054 fps | 96.7% |
| Vihtavuori N140 | <<locked>> | 82% | 28,398 psi | 73% | 2100 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 86% | 30,995 psi | 79% | 2178 fps | 95.5% |
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 50 powders for 10.3 x 60 R Swiss loaded with the .411 | 300gr | Hornady InterLock SP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,323 fps; across all powders the maximum-charge window runs from 1,493 fps to 2,323 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 50 of the 50 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. IMR 3031, Accurate 4064, Accurate 2495 rank at the top here: for 10.3 x 60 R Swiss with the .411 | 300gr | Hornady InterLock SP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2206H, ADI Benchmark 8208, Alliant Reloder- TS 15.5 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.