Load Specifications
Load data in caliber .350 Mag. Rigby with .357 | 180gr | Impala LWHV LS bullet and 28 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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 39,465 psi | 88% | 2743 fps | 99.8% |
| Accurate 2520 | <<locked>> | 82% | 38,653 psi | 86% | 2743 fps | 97.3% |
| Accurate 2520 | <<locked>> | 82% | 38,653 psi | 86% | 2743 fps | 97.3% |
| Accurate 4064 | <<locked>> | 88% | 39,349 psi | 88% | 2762 fps | 98.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 40,059 psi | 89% | 2726 fps | 95.7% |
| Alliant AR-Comp | <<locked>> | 82% | 38,508 psi | 86% | 2756 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 40,582 psi | 90% | 2795 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,418 psi | 77% | 1834 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 40,509 psi | 90% | 2822 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 82% | 40,059 psi | 89% | 2726 fps | 95.7% |
| Lovex D073.6 | <<locked>> | 84% | 38,827 psi | 86% | 2749 fps | 97.3% |
| Lovex S062 | <<locked>> | 88% | 40,553 psi | 90% | 2753 fps | 96% |
| Norma 201 | <<locked>> | 84% | 40,306 psi | 90% | 2730 fps | 95.9% |
| Norma 202 | <<locked>> | 84% | 39,740 psi | 88% | 2746 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,780 psi | 77% | 1880 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 40,030 psi | 89% | 2854 fps | 96.9% |
| Rottweil R 902 | <<locked>> | 86% | 40,596 psi | 90% | 2730 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 84% | 38,827 psi | 86% | 2749 fps | 97.3% |
| Shooters World Precision | <<locked>> | 88% | 40,553 psi | 90% | 2753 fps | 96% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 39,363 psi | 88% | 2651 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 38,493 psi | 86% | 2648 fps | 98.7% |
| Somchem S335 | <<locked>> | 82% | 38,870 psi | 86% | 2657 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 39,117 psi | 87% | 2657 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 86% | 38,696 psi | 86% | 2726 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 86% | 39,813 psi | 89% | 2723 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 92% | 38,943 psi | 87% | 2717 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 82% | 40,059 psi | 89% | 2723 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 86% | 38,624 psi | 86% | 2713 fps | 97.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 32,924 psi | 73% | 2592 fps | 98.9% |
| Accurate 2520 | <<locked>> | 80% | 36,318 psi | 81% | 2690 fps | 96.6% |
| Accurate 2520 | <<locked>> | 80% | 36,318 psi | 81% | 2690 fps | 96.6% |
| Accurate 4064 | 56.5 gr | 80% | 31,096 psi | 69% | 2559 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 37,768 psi | 84% | 2674 fps | 95% |
| Alliant AR-Comp | <<locked>> | 80% | 36,172 psi | 80% | 2707 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,810 psi | 80% | 2684 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,817 psi | 57% | 1644 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 32,010 psi | 71% | 2615 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 80% | 37,768 psi | 84% | 2674 fps | 95% |
| Lovex D073.6 | <<locked>> | 80% | 34,185 psi | 76% | 2638 fps | 95.9% |
| Lovex S062 | <<locked>> | 86% | 38,276 psi | 85% | 2703 fps | 95.4% |
| Norma 201 | <<locked>> | 82% | 37,884 psi | 84% | 2674 fps | 95.1% |
| Norma 202 | <<locked>> | 80% | 35,201 psi | 78% | 2638 fps | 97% |
| ReloadSwiss RS 14 | 19.8 gr | 80% | 25,904 psi | 58% | 1680 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 37,666 psi | 84% | 2792 fps | 96% |
| Rottweil R 902 | <<locked>> | 84% | 38,392 psi | 85% | 2677 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,185 psi | 76% | 2638 fps | 95.9% |
| Shooters World Precision | <<locked>> | 86% | 38,276 psi | 85% | 2703 fps | 95.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,086 psi | 82% | 2598 fps | 97.5% |
| SNPE Vectan Tubal 5000 | 54.6 gr | 80% | 30,414 psi | 68% | 2454 fps | 96.5% |
| Somchem S335 | <<locked>> | 80% | 36,753 psi | 82% | 2608 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 80% | 36,840 psi | 82% | 2608 fps | 99.4% |
| Vihtavuori N135 | <<locked>> | 80% | 32,343 psi | 72% | 2579 fps | 98.8% |
| Vihtavuori N140 | <<locked>> | 80% | 33,373 psi | 74% | 2572 fps | 96.8% |
| Vihtavuori N150 | <<locked>> | 90% | 36,695 psi | 82% | 2667 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 37,550 psi | 84% | 2667 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 32,111 psi | 71% | 2552 fps | 95.7% |
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 .350 Mag. Rigby loaded with the .357 | 180gr | Impala LWHV LS. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,854 fps; across all powders the maximum-charge window runs from 1,834 fps to 2,854 fps. Hodgdon TrailBoss 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 (310 MPa), the top charges use 77–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.357" calls for a 1:15.0 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 .350 Mag. Rigby with the .357 | 180gr | Impala LWHV LS 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.