Load Specifications
Load data in caliber .350 Mag. Rigby with .357 | 158gr | X-TREME FP bullet and 24 powders. The key underlying parameters are shown in the table above.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 38,305 psi | 85% | 2871 fps | 99% |
| Accurate 2460 | <<locked>> | 82% | 39,044 psi | 87% | 2907 fps | 96.8% |
| Accurate 2495 | <<locked>> | 92% | 39,334 psi | 87% | 2956 fps | 99.4% |
| Accurate 2520 | <<locked>> | 86% | 39,305 psi | 87% | 2949 fps | 96.4% |
| Accurate 4064 | <<locked>> | 94% | 39,349 psi | 88% | 2976 fps | 97.6% |
| Alliant AR-Comp | <<locked>> | 88% | 40,248 psi | 90% | 3009 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 39,769 psi | 88% | 2953 fps | 98.1% |
| Hodgdon H335 | <<locked>> | 82% | 40,466 psi | 90% | 2963 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,272 psi | 74% | 1969 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 38,276 psi | 85% | 2979 fps | 98.6% |
| Lovex D073.6 | <<locked>> | 90% | 40,451 psi | 90% | 2986 fps | 96.7% |
| Norma 202 | <<locked>> | 88% | 39,044 psi | 87% | 2930 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,359 psi | 74% | 2014 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 39,610 psi | 88% | 2920 fps | 96% |
| Rottweil R 901 | <<locked>> | 86% | 40,451 psi | 90% | 2927 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 90% | 40,451 psi | 90% | 2986 fps | 96.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 38,943 psi | 87% | 2838 fps | 96.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 40,596 psi | 90% | 2890 fps | 98.4% |
| Somchem S335 | <<locked>> | 88% | 40,524 psi | 90% | 2894 fps | 98.2% |
| Vihtavuori N130 | <<locked>> | 82% | 39,175 psi | 87% | 2851 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 86% | 38,696 psi | 86% | 2851 fps | 99% |
| Vihtavuori N135 | <<locked>> | 92% | 40,045 psi | 89% | 2966 fps | 99.5% |
| Vihtavuori N140 | <<locked>> | 90% | 39,407 psi | 88% | 2913 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 92% | 40,480 psi | 90% | 2949 fps | 97.3% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 33,736 psi | 75% | 2759 fps | 98% |
| Accurate 2460 | <<locked>> | 80% | 36,434 psi | 81% | 2841 fps | 95.9% |
| Accurate 2495 | <<locked>> | 80% | 26,223 psi | 58% | 2605 fps | 95.5% |
| Accurate 2520 | <<locked>> | 84% | 36,622 psi | 81% | 2887 fps | 95.5% |
| Accurate 4064 | <<locked>> | 88% | 32,314 psi | 72% | 2799 fps | 95.3% |
| Alliant AR-Comp | <<locked>> | 80% | 30,951 psi | 69% | 2779 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 80% | 37,231 psi | 83% | 2894 fps | 97.5% |
| Hodgdon H335 | <<locked>> | 80% | 37,782 psi | 84% | 2900 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,584 psi | 55% | 1762 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 29,544 psi | 66% | 2740 fps | 95.5% |
| Lovex D073.6 | <<locked>> | 86% | 35,215 psi | 78% | 2864 fps | 95% |
| Norma 202 | <<locked>> | 84% | 34,272 psi | 76% | 2812 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 24,598 psi | 55% | 1804 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 36,999 psi | 82% | 2858 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 82% | 35,781 psi | 80% | 2815 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 35,215 psi | 78% | 2864 fps | 95% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 34,432 psi | 77% | 2730 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 31,459 psi | 70% | 2671 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 31,662 psi | 70% | 2674 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 36,695 psi | 82% | 2795 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 80% | 32,039 psi | 71% | 2690 fps | 97.4% |
| Vihtavuori N135 | <<locked>> | 80% | 27,079 psi | 60% | 2625 fps | 95.7% |
| Vihtavuori N140 | <<locked>> | 84% | 32,445 psi | 72% | 2743 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 88% | 35,505 psi | 79% | 2835 fps | 95.7% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 24 powders for .350 Mag. Rigby loaded with the .357 | 158gr | X-TREME FP. Alliant AR-Comp delivers the highest muzzle velocity at 3,009 fps; across all powders the maximum-charge window runs from 1,969 fps to 3,009 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 24 of the 24 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (310 MPa), the top charges use 74–90 %, 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.