Load Specifications
Load data in caliber .350 Mag. Rigby with .357 | 158gr | Fiocchi SJSP bullet and 21 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate 4064, Vihtavuori N140 and Vihtavuori N135.
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 2015 | <<locked>> | 82% | 38,653 psi | 86% | 2900 fps | 99.3% |
| Accurate 2495 | <<locked>> | 90% | 40,205 psi | 89% | 2989 fps | 99.7% |
| Accurate 2520 | <<locked>> | 84% | 39,668 psi | 88% | 2979 fps | 97% |
| Accurate 4064 | <<locked>> | 92% | 40,205 psi | 89% | 3012 fps | 98.2% |
| Alliant AR-Comp | <<locked>> | 84% | 38,072 psi | 85% | 2976 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 40,524 psi | 90% | 3015 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,649 psi | 75% | 2005 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 38,841 psi | 86% | 3015 fps | 99% |
| Lovex D073.6 | <<locked>> | 86% | 38,232 psi | 85% | 2956 fps | 96.5% |
| Norma 202 | <<locked>> | 86% | 39,349 psi | 88% | 2959 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,721 psi | 75% | 2051 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 40,190 psi | 89% | 3074 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 82% | 38,319 psi | 85% | 2900 fps | 97% |
| Shooters World Match Rifle | <<locked>> | 86% | 38,232 psi | 85% | 2956 fps | 96.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 39,117 psi | 87% | 2867 fps | 97.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 38,276 psi | 85% | 2861 fps | 98.2% |
| Somchem S335 | <<locked>> | 84% | 38,421 psi | 85% | 2867 fps | 98.1% |
| Vihtavuori N133 | <<locked>> | 84% | 38,986 psi | 87% | 2881 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 90% | 40,640 psi | 90% | 2995 fps | 99.7% |
| Vihtavuori N140 | <<locked>> | 88% | 39,697 psi | 88% | 2943 fps | 98% |
| Vihtavuori N540 | <<locked>> | 88% | 38,305 psi | 85% | 2920 fps | 97.1% |
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 2015 | <<locked>> | 80% | 36,172 psi | 80% | 2841 fps | 98.9% |
| Accurate 2495 | <<locked>> | 80% | 28,631 psi | 64% | 2694 fps | 97% |
| Accurate 2520 | <<locked>> | 80% | 34,519 psi | 77% | 2851 fps | 95.3% |
| Accurate 4064 | 66.4 gr | 84% | 31,009 psi | 69% | 2776 fps | 95.2% |
| Alliant AR-Comp | <<locked>> | 80% | 33,330 psi | 74% | 2861 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 84% | 37,811 psi | 84% | 2949 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,932 psi | 55% | 1798 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 31,792 psi | 71% | 2828 fps | 97% |
| Lovex D073.6 | <<locked>> | 84% | 35,636 psi | 79% | 2890 fps | 95.6% |
| Norma 202 | <<locked>> | 80% | 32,445 psi | 72% | 2782 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,976 psi | 56% | 1837 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 37,623 psi | 84% | 3002 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 36,114 psi | 80% | 2841 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 84% | 35,636 psi | 79% | 2890 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 34,403 psi | 77% | 2753 fps | 95.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 29,689 psi | 66% | 2641 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 33,852 psi | 75% | 2756 fps | 96.8% |
| Vihtavuori N133 | <<locked>> | 80% | 34,272 psi | 76% | 2769 fps | 98.4% |
| Vihtavuori N135 | 61.1 gr | 80% | 29,327 psi | 65% | 2713 fps | 97.2% |
| Vihtavuori N140 | 65.5 gr | 82% | 32,648 psi | 73% | 2769 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 84% | 33,576 psi | 75% | 2802 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 21 powders for .350 Mag. Rigby loaded with the .357 | 158gr | Fiocchi SJSP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,074 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,074 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 21 of the 21 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (310 MPa), the top charges use 75–90 %, 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. Accurate 4064, Vihtavuori N140, Vihtavuori N135 rank at the top here: for .350 Mag. Rigby with the .357 | 158gr | Fiocchi SJSP 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.