Load Specifications
Load data in caliber 10.3 x 60 R Swiss with .411 | 300gr | NorthFork Bonded Core 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>> | 84% | 33,910 psi | 87% | 2185 fps | 98.8% |
| Accurate 2460 | <<locked>> | 82% | 34,098 psi | 87% | 2208 fps | 96.2% |
| Accurate 2495 | <<locked>> | 92% | 33,460 psi | 85% | 2251 fps | 99.1% |
| Accurate 4064 | <<locked>> | 94% | 33,504 psi | 86% | 2264 fps | 97% |
| Alliant AR-Comp | <<locked>> | 88% | 35,375 psi | 90% | 2293 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 35,418 psi | 90% | 2247 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,706 psi | 84% | 1467 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 33,707 psi | 86% | 2270 fps | 98.2% |
| Lovex D073.6 | <<locked>> | 90% | 34,563 psi | 88% | 2270 fps | 95.9% |
| Norma 202 | <<locked>> | 88% | 34,360 psi | 88% | 2234 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,808 psi | 84% | 1503 fps | 100% |
| Rottweil R 901 | <<locked>> | 84% | 34,084 psi | 87% | 2188 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 90% | 34,563 psi | 88% | 2270 fps | 95.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 34,983 psi | 89% | 2162 fps | 96.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 33,852 psi | 86% | 2159 fps | 97.4% |
| Somchem S335 | <<locked>> | 86% | 33,997 psi | 87% | 2165 fps | 97.3% |
| Vihtavuori N130 | <<locked>> | 82% | 35,172 psi | 90% | 2169 fps | 99.5% |
| Vihtavuori N133 | <<locked>> | 86% | 34,606 psi | 88% | 2172 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 92% | 34,896 psi | 89% | 2260 fps | 99.2% |
| Vihtavuori N140 | <<locked>> | 90% | 34,563 psi | 88% | 2218 fps | 97% |
| Vihtavuori N540 | <<locked>> | 92% | 35,360 psi | 90% | 2251 fps | 96.6% |
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% | 30,066 psi | 77% | 2103 fps | 97.9% |
| Accurate 2460 | <<locked>> | 80% | 31,937 psi | 82% | 2162 fps | 95.4% |
| Accurate 2495 | 53 gr | 80% | 22,510 psi | 57% | 1982 fps | 95.2% |
| Accurate 4064 | 59.7 gr | 90% | 29,588 psi | 76% | 2175 fps | 95.6% |
| Alliant AR-Comp | <<locked>> | 80% | 27,427 psi | 70% | 2113 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 80% | 33,127 psi | 85% | 2198 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,265 psi | 62% | 1312 fps | 100% |
| IMR 3031 | 52.4 gr | 80% | 26,353 psi | 67% | 2087 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 88% | 32,314 psi | 83% | 2221 fps | 95.1% |
| Norma 202 | <<locked>> | 84% | 30,284 psi | 77% | 2146 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,134 psi | 62% | 1342 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 32,155 psi | 82% | 2146 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 32,314 psi | 83% | 2221 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 30,908 psi | 79% | 2073 fps | 95.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 28,253 psi | 72% | 2034 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 28,340 psi | 72% | 2037 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 33,214 psi | 85% | 2129 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 80% | 28,892 psi | 74% | 2051 fps | 97.3% |
| Vihtavuori N135 | <<locked>> | 80% | 24,076 psi | 61% | 2001 fps | 95.6% |
| Vihtavuori N140 | <<locked>> | 86% | 30,516 psi | 78% | 2129 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 88% | 31,169 psi | 80% | 2162 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 55 powders for 10.3 x 60 R Swiss loaded with the .411 | 300gr | NorthFork Bonded Core. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,300 fps; across all powders the maximum-charge window runs from 1,467 fps to 2,300 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 55 of the 55 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 | NorthFork Bonded Core 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 Power Pro 1200-R 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.