Load Specifications
Load data in caliber 10.3 x 60 R Swiss with .410 | 235gr | Impala LWHV LS bullet and 10 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>> | 90% | 34,461 psi | 88% | 2425 fps | 95.8% |
| Accurate 2495ᴾ | <<locked>> | 100% | 35,099 psi | 90% | 2523 fps | 96.6% |
| Alliant AR-Comp | <<locked>> | 92% | 33,663 psi | 86% | 2480 fps | 98% |
| Alliant Reloder-10x | <<locked>> | 86% | 35,259 psi | 90% | 2457 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,010 psi | 82% | 1624 fps | 100% |
| IMR 4198 | <<locked>> | 84% | 35,186 psi | 90% | 2405 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,836 psi | 81% | 1660 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 34,098 psi | 87% | 2372 fps | 96.7% |
| Vihtavuori N133 | <<locked>> | 92% | 35,201 psi | 90% | 2405 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 98% | 34,534 psi | 88% | 2474 fps | 95.9% |
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>> | 88% | 32,474 psi | 83% | 2375 fps | 95.1% |
| Accurate 2495 | <<locked>> | 96% | 30,995 psi | 79% | 2428 fps | 95.2% |
| Alliant AR-Comp | 52.6 gr | 84% | 27,035 psi | 69% | 2290 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 29,646 psi | 76% | 2320 fps | 95.4% |
| Hodgdon TrailBoss | 17.4 gr | 80% | 23,728 psi | 61% | 1450 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 31,618 psi | 81% | 2316 fps | 97% |
| ReloadSwiss RS 14 | 17.8 gr | 80% | 23,743 psi | 61% | 1486 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 30,603 psi | 78% | 2287 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 90% | 33,214 psi | 85% | 2356 fps | 95% |
| Vihtavuori N135 | <<locked>> | 96% | 32,750 psi | 84% | 2431 fps | 95.2% |
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 28 powders for 10.3 x 60 R Swiss loaded with the .410 | 235gr | Impala LWHV LS. Accurate 2495 delivers the highest muzzle velocity at 2,523 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,523 fps. Accurate 2495 gives the best case fill at 100 %, and 28 of the 28 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 81–90 %, leaving at least 10 % headroom. The 235.0 gr projectile in 0.41" calls for a 1:19.0 twist; slower twists will usually not stabilise this weight. 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 | 235gr | Impala LWHV LS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2460, Accurate 4064, ADI AR 2219 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.