Load Specifications
Load data in caliber .416 Rigby with .416 | 365gr | Atomic 29 HP bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, ReloadSwiss RS 70 and Alliant Reloder-17.
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>> | 82% | 41,017 psi | 87% | 2287 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 41,481 psi | 88% | 2326 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 40,190 psi | 85% | 2375 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 84% | 41,147 psi | 87% | 2306 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 41,350 psi | 88% | 2428 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 40,509 psi | 86% | 2323 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 82% | 40,886 psi | 87% | 2336 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 92% | 40,292 psi | 85% | 2388 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 40,132 psi | 85% | 2411 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,448 psi | 77% | 2343 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,321 psi | 86% | 2477 fps | 97.5% |
| Bofors RP3 | <<locked>> | 84% | 40,103 psi | 85% | 2329 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 41,104 psi | 87% | 2333 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 41,959 psi | 89% | 2379 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 41,698 psi | 88% | 2382 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,230 psi | 75% | 1503 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 40,495 psi | 86% | 2287 fps | 98.5% |
| IMR 4831 | <<locked>> | 94% | 41,379 psi | 88% | 2379 fps | 98.2% |
| IMR 4895 | <<locked>> | 82% | 41,901 psi | 89% | 2362 fps | 99.1% |
| Lovex S062 | <<locked>> | 82% | 40,234 psi | 85% | 2290 fps | 99.6% |
| Lovex S065 | <<locked>> | 90% | 42,177 psi | 89% | 2329 fps | 96.9% |
| Lovex S070 | <<locked>> | 92% | 42,540 psi | 90% | 2356 fps | 95.9% |
| Norma 203B | <<locked>> | 82% | 40,219 psi | 85% | 2323 fps | 98.8% |
| Norma URP | <<locked>> | 92% | 40,379 psi | 86% | 2372 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 82% | 39,856 psi | 85% | 2339 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 94% | 42,337 psi | 90% | 2415 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,592 psi | 76% | 1539 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,698 psi | 88% | 2320 fps | 96% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 40,016 psi | 85% | 2418 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 39,900 psi | 85% | 2392 fps | 97.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,277 psi | 85% | 2405 fps | 96.9% |
| Rottweil R 902 | <<locked>> | 82% | 42,061 psi | 89% | 2303 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 86% | 40,147 psi | 85% | 2323 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 42,177 psi | 89% | 2329 fps | 96.9% |
| Shooters World Precision | <<locked>> | 82% | 40,234 psi | 85% | 2290 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 92% | 42,540 psi | 90% | 2356 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 41,495 psi | 88% | 2375 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 40,640 psi | 86% | 2228 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 41,031 psi | 87% | 2326 fps | 99.3% |
| Somchem S365 | <<locked>> | 96% | 41,118 psi | 87% | 2428 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 41,626 psi | 88% | 2283 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 42,409 psi | 90% | 2297 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 41,930 psi | 89% | 2316 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 92% | 42,482 psi | 90% | 2375 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 82% | 40,698 psi | 86% | 2290 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 41,669 psi | 88% | 2379 fps | 97.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,392 psi | 84% | 2408 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 42,627 psi | 90% | 2359 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,358 psi | 69% | 2333 fps | 98% |
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% | 38,435 psi | 82% | 2244 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 36,405 psi | 77% | 2238 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 32,518 psi | 69% | 2224 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 36,245 psi | 77% | 2211 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 38,479 psi | 82% | 2369 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,636 psi | 76% | 2231 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,319 psi | 81% | 2287 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,446 psi | 71% | 2241 fps | 95.8% |
| Alliant Reloder-17 | 79.4 gr | 80% | 30,574 psi | 65% | 2198 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,485 psi | 60% | 2149 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,085 psi | 74% | 2362 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 34,896 psi | 74% | 2231 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 80% | 36,013 psi | 76% | 2234 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,558 psi | 61% | 2100 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,885 psi | 82% | 2329 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,136 psi | 55% | 1342 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,043 psi | 81% | 2241 fps | 98% |
| IMR 4831 | <<locked>> | 86% | 31,763 psi | 67% | 2188 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 39,233 psi | 83% | 2313 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 37,811 psi | 80% | 2244 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 37,231 psi | 79% | 2238 fps | 95.5% |
| Lovex S070 | <<locked>> | 90% | 39,885 psi | 85% | 2306 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 37,666 psi | 80% | 2277 fps | 98.3% |
| Norma URP | <<locked>> | 86% | 33,214 psi | 70% | 2228 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 37,101 psi | 79% | 2287 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 39,581 psi | 84% | 2362 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,411 psi | 56% | 1375 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 38,986 psi | 83% | 2270 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,619 psi | 69% | 2257 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,489 psi | 69% | 2238 fps | 95% |
| ReloadSwiss RS 70 | 88.7 gr | 88% | 35,230 psi | 75% | 2297 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 39,552 psi | 84% | 2257 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 32,866 psi | 70% | 2182 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,231 psi | 79% | 2238 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 37,811 psi | 80% | 2244 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 39,885 psi | 85% | 2306 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,040 psi | 72% | 2228 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,781 psi | 76% | 2146 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 33,910 psi | 72% | 2188 fps | 97.8% |
| Somchem S365 | 77.2 gr | 82% | 25,976 psi | 55% | 2083 fps | 96% |
| Vihtavuori N135 | <<locked>> | 80% | 39,001 psi | 83% | 2244 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,726 psi | 84% | 2254 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,198 psi | 68% | 2136 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 32,605 psi | 69% | 2182 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 38,174 psi | 81% | 2244 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 34,171 psi | 72% | 2231 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 92% | 30,298 psi | 64% | 2215 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,601 psi | 61% | 2067 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,427 psi | 60% | 2215 fps | 95.6% |
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 49 powders for .416 Rigby loaded with the .416 | 365gr | Atomic 29 HP. Alliant Reloder-26 delivers the highest muzzle velocity at 2,477 fps; across all powders the maximum-charge window runs from 1,503 fps to 2,477 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 49 of the 49 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 365.0 gr projectile in 0.416" calls for a 1:19.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, 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. Somchem S365, ReloadSwiss RS 70, Alliant Reloder-17 rank at the top here: for .416 Rigby with the .416 | 365gr | Atomic 29 HP 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.