Load Specifications
Load data in caliber .350 Mag. Rigby with .358 | 200gr | NorthFork Bonded Core bullet and 36 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Bofors RP3 and Somchem S365.
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% | 40,538 psi | 90% | 2671 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 38,189 psi | 85% | 2651 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 82% | 39,900 psi | 89% | 2664 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 39,827 psi | 89% | 2684 fps | 97.1% |
| Alliant Reloder-17 | <<locked>> | 92% | 39,784 psi | 88% | 2759 fps | 96.3% |
| Bofors RP3 | <<locked>> | 88% | 39,305 psi | 87% | 2684 fps | 97.1% |
| Hodgdon BL-C2 | <<locked>> | 82% | 40,059 psi | 89% | 2694 fps | 98% |
| Hodgdon H4895 | <<locked>> | 82% | 40,176 psi | 89% | 2677 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 38,609 psi | 86% | 2671 fps | 96% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 38,377 psi | 85% | 2687 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,548 psi | 77% | 1772 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 38,769 psi | 86% | 2631 fps | 96.3% |
| IMR 3031 | <<locked>> | 82% | 39,001 psi | 87% | 2687 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 38,870 psi | 86% | 2674 fps | 95.8% |
| Lovex D073.6 | <<locked>> | 82% | 38,203 psi | 85% | 2644 fps | 98.5% |
| Lovex S060 | <<locked>> | 82% | 40,654 psi | 90% | 2612 fps | 96.3% |
| Lovex S062 | <<locked>> | 86% | 39,842 psi | 89% | 2651 fps | 97.5% |
| Norma 201 | <<locked>> | 82% | 39,001 psi | 87% | 2618 fps | 97.2% |
| Norma 202 | <<locked>> | 82% | 39,175 psi | 87% | 2641 fps | 99.2% |
| Norma 203B | <<locked>> | 86% | 39,769 psi | 88% | 2684 fps | 96.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,838 psi | 77% | 1811 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 39,726 psi | 88% | 2776 fps | 98.7% |
| Rottweil R 902 | <<locked>> | 84% | 39,479 psi | 88% | 2621 fps | 97.3% |
| Rottweil R 903 | <<locked>> | 90% | 39,392 psi | 88% | 2677 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 38,203 psi | 85% | 2644 fps | 98.5% |
| Shooters World Precision | <<locked>> | 86% | 39,842 psi | 89% | 2651 fps | 97.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 40,393 psi | 90% | 2598 fps | 99.8% |
| Somchem S335 | <<locked>> | 82% | 40,234 psi | 89% | 2595 fps | 99.7% |
| Somchem S355 | <<locked>> | 90% | 40,538 psi | 90% | 2690 fps | 96.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,943 psi | 89% | 2772 fps | 98% |
| Vihtavuori N135 | <<locked>> | 84% | 38,435 psi | 85% | 2621 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 39,436 psi | 88% | 2625 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 90% | 38,711 psi | 86% | 2625 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 86% | 40,480 psi | 90% | 2661 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 39,987 psi | 89% | 2654 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 84% | 40,248 psi | 90% | 2687 fps | 96.8% |
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% | 33,344 psi | 74% | 2516 fps | 99.8% |
| Accurate 4064 | <<locked>> | 80% | 31,517 psi | 70% | 2493 fps | 97.8% |
| ADI AR 2206H | <<locked>> | 80% | 37,463 psi | 83% | 2608 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 35,143 psi | 78% | 2579 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 90% | 37,231 psi | 83% | 2697 fps | 95.3% |
| Bofors RP3 | 64.2 gr | 84% | 34,432 psi | 77% | 2575 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,434 psi | 83% | 2635 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 80% | 37,695 psi | 84% | 2621 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 36,187 psi | 80% | 2615 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,707 psi | 75% | 2572 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,628 psi | 57% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,332 psi | 81% | 2575 fps | 95.5% |
| IMR 3031 | <<locked>> | 80% | 36,419 psi | 81% | 2631 fps | 99.7% |
| IMR 4895 | <<locked>> | 82% | 36,448 psi | 81% | 2618 fps | 95% |
| Lovex D073.6 | <<locked>> | 80% | 35,636 psi | 79% | 2589 fps | 97.9% |
| Lovex S060 | <<locked>> | 80% | 38,189 psi | 85% | 2559 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 33,040 psi | 73% | 2493 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 36,767 psi | 82% | 2569 fps | 96.6% |
| Norma 202 | <<locked>> | 80% | 36,724 psi | 82% | 2589 fps | 98.7% |
| Norma 203B | <<locked>> | 84% | 37,289 psi | 83% | 2631 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,817 psi | 57% | 1621 fps | 100% |
| ReloadSwiss RS 60 | 66.6 gr | 84% | 32,576 psi | 72% | 2585 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 34,925 psi | 78% | 2516 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 86% | 34,534 psi | 77% | 2569 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,636 psi | 79% | 2589 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 33,040 psi | 73% | 2493 fps | 95.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,459 psi | 70% | 2405 fps | 98.3% |
| Somchem S335 | <<locked>> | 80% | 37,927 psi | 84% | 2549 fps | 99.4% |
| Somchem S355 | <<locked>> | 86% | 35,679 psi | 79% | 2579 fps | 95.3% |
| Somchem S365 | 70.7 gr | 94% | 33,040 psi | 73% | 2598 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 33,707 psi | 75% | 2520 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 34,635 psi | 77% | 2520 fps | 98.6% |
| Vihtavuori N150 | <<locked>> | 84% | 31,807 psi | 71% | 2464 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 33,373 psi | 74% | 2503 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 37,333 psi | 83% | 2595 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,114 psi | 78% | 2572 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 36 powders for .350 Mag. Rigby loaded with the .358 | 200gr | NorthFork Bonded Core. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,776 fps; across all powders the maximum-charge window runs from 1,772 fps to 2,776 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 36 of the 36 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. Hodgdon TrailBoss, ReloadSwiss RS 14, Somchem S365 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. ReloadSwiss RS 60, Bofors RP3, Somchem S365 rank at the top here: for .350 Mag. Rigby with the .358 | 200gr | NorthFork Bonded Core 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.