Load Specifications
Load data in caliber .450 Rigby with .458 | 461gr | TWENTY-NINE SILENTIO bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 52 and Hodgdon LEVERevolution.
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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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>> | 90% | 49,922 psi | 86% | 2182 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 50,705 psi | 87% | 2251 fps | 98.4% |
| Accurate 2230 | <<locked>> | 82% | 50,894 psi | 88% | 2257 fps | 98.7% |
| Accurate 2460 | <<locked>> | 88% | 51,430 psi | 89% | 2238 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 52,460 psi | 90% | 2264 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 52,373 psi | 90% | 2287 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 51,837 psi | 89% | 2293 fps | 100% |
| Accurate LT-30 | <<locked>> | 84% | 51,198 psi | 88% | 2142 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 51,590 psi | 89% | 2159 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 52,025 psi | 90% | 2287 fps | 99.2% |
| ADI AR 2207 | <<locked>> | 82% | 52,228 psi | 90% | 2156 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 49,647 psi | 86% | 2238 fps | 98.3% |
| ADI AR 2219 | <<locked>> | 84% | 50,459 psi | 87% | 2234 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 51,590 psi | 89% | 2254 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 92% | 50,270 psi | 87% | 2241 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 49,545 psi | 85% | 2293 fps | 99.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 51,126 psi | 88% | 2365 fps | 98.4% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 51,169 psi | 88% | 2293 fps | 99.6% |
| Alliant Reloder-10x | <<locked>> | 86% | 50,314 psi | 87% | 2188 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 52,301 psi | 90% | 2313 fps | 98.9% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 45,353 psi | 78% | 2290 fps | 98.6% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 49,777 psi | 86% | 2142 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 51,329 psi | 88% | 2297 fps | 98.2% |
| Bofors RP3ᴾ | <<locked>> | 100% | 51,169 psi | 88% | 2306 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 90% | 51,140 psi | 88% | 2208 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 92% | 49,458 psi | 85% | 2277 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 90% | 51,227 psi | 88% | 2349 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 88% | 52,446 psi | 90% | 2260 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 49,879 psi | 86% | 2241 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 49,922 psi | 86% | 2270 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 94% | 52,373 psi | 90% | 2297 fps | 99.5% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 36,216 psi | 62% | 2077 fps | 96.2% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 50,415 psi | 87% | 2320 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,098 psi | 59% | 1329 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 50,618 psi | 87% | 2257 fps | 99.3% |
| IMR 3031 | <<locked>> | 94% | 50,836 psi | 88% | 2287 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 52,301 psi | 90% | 2264 fps | 98.8% |
| IMR 4198 | <<locked>> | 86% | 51,198 psi | 88% | 2156 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 50,502 psi | 87% | 2300 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 92% | 51,590 psi | 89% | 2254 fps | 99.7% |
| Lovex D073.4 | <<locked>> | 82% | 51,532 psi | 89% | 2244 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 51,372 psi | 89% | 2244 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 94% | 50,227 psi | 87% | 2270 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 49,937 psi | 86% | 2192 fps | 98.8% |
| Lovex S062 | <<locked>> | 98% | 51,343 psi | 89% | 2264 fps | 99.7% |
| Norma 200 | <<locked>> | 82% | 50,270 psi | 87% | 2169 fps | 100% |
| Norma 201 | <<locked>> | 94% | 50,821 psi | 88% | 2244 fps | 99.7% |
| Norma 202 | <<locked>> | 94% | 50,894 psi | 88% | 2254 fps | 100% |
| Norma 203B | <<locked>> | 98% | 51,387 psi | 89% | 2303 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 98% | 51,764 psi | 89% | 2323 fps | 99% |
| Ramshot TAC | <<locked>> | 92% | 52,127 psi | 90% | 2260 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 92% | 50,821 psi | 88% | 2280 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 88% | 49,879 psi | 86% | 2215 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,229 psi | 59% | 1358 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 51,576 psi | 89% | 2247 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 50,879 psi | 88% | 2254 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 51,721 psi | 89% | 2362 fps | 98.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 48,515 psi | 84% | 2346 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 51,996 psi | 90% | 2234 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 51,068 psi | 88% | 2241 fps | 99.7% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 47,514 psi | 82% | 2254 fps | 99.1% |
| Shooters World AR Plus | <<locked>> | 82% | 51,532 psi | 89% | 2244 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 94% | 50,227 psi | 87% | 2270 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 51,343 psi | 89% | 2264 fps | 99.7% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 51,750 psi | 89% | 2221 fps | 99.5% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 50,749 psi | 87% | 2244 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 49,850 psi | 86% | 2306 fps | 98.8% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 51,097 psi | 88% | 2201 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 49,719 psi | 86% | 2238 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 50,372 psi | 87% | 2264 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 50,357 psi | 87% | 2169 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 52,489 psi | 90% | 2201 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 49,226 psi | 85% | 2244 fps | 99.7% |
| Somchem S335 | <<locked>> | 94% | 52,243 psi | 90% | 2205 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 49,197 psi | 85% | 2238 fps | 98.7% |
| Somchem S355ᴾ | <<locked>> | 100% | 48,733 psi | 84% | 2257 fps | 99.1% |
| Somchem S365ᴾ | <<locked>> | 100% | 34,954 psi | 60% | 2116 fps | 97.4% |
| Vihtavuori N120 | <<locked>> | 82% | 52,199 psi | 90% | 2113 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 50,430 psi | 87% | 2149 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 50,082 psi | 86% | 2159 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 49,530 psi | 85% | 2221 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 51,314 psi | 88% | 2234 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 46,978 psi | 81% | 2205 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 92% | 52,011 psi | 90% | 2254 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 96% | 49,400 psi | 85% | 2234 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 43,033 psi | 74% | 2156 fps | 98% |
| Winchester 748 | <<locked>> | 92% | 50,502 psi | 87% | 2290 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 94% | 49,588 psi | 85% | 2270 fps | 99.2% |
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% | 36,782 psi | 63% | 2001 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 47,500 psi | 82% | 2205 fps | 97.8% |
| Accurate 2230 | <<locked>> | 80% | 47,500 psi | 82% | 2211 fps | 98.2% |
| Accurate 2460 | <<locked>> | 80% | 39,537 psi | 68% | 2073 fps | 99.6% |
| Accurate 2495 | <<locked>> | 80% | 29,225 psi | 50% | 1923 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 34,911 psi | 60% | 2034 fps | 98.7% |
| Accurate 4064 | <<locked>> | 80% | 27,688 psi | 48% | 1906 fps | 97.8% |
| Accurate LT-30 | <<locked>> | 80% | 45,469 psi | 78% | 2070 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 45,818 psi | 79% | 2083 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 33,649 psi | 58% | 1995 fps | 95.2% |
| ADI AR 2207 | <<locked>> | 80% | 49,284 psi | 85% | 2123 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 36,840 psi | 64% | 2037 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 44,092 psi | 76% | 2152 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 35,578 psi | 61% | 2008 fps | 97.2% |
| Alliant AR-Comp | <<locked>> | 80% | 33,881 psi | 58% | 2018 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 40,669 psi | 70% | 2159 fps | 98% |
| Alliant Power Pro 2000-MR | 78.7 gr | 88% | 39,378 psi | 68% | 2175 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 31,067 psi | 54% | 1972 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 41,887 psi | 72% | 2080 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 36,114 psi | 62% | 2064 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 92% | 35,172 psi | 61% | 2106 fps | 95.7% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 43,787 psi | 75% | 2067 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 39,610 psi | 68% | 2123 fps | 95.7% |
| Bofors RP3 | <<locked>> | 84% | 30,255 psi | 52% | 1969 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 37,913 psi | 65% | 2011 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 33,098 psi | 57% | 2018 fps | 97.2% |
| Hodgdon CFE223 | <<locked>> | 80% | 36,622 psi | 63% | 2113 fps | 95.5% |
| Hodgdon H322 | <<locked>> | 80% | 40,495 psi | 70% | 2100 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 40,799 psi | 70% | 2116 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 92% | 41,118 psi | 71% | 2142 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 33,837 psi | 58% | 2005 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 34,127 psi | 59% | 2037 fps | 95.4% |
| Hodgdon LEVERevolution | 71.9 gr | 82% | 32,169 psi | 55% | 2014 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,222 psi | 43% | 1184 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 32,793 psi | 57% | 1969 fps | 95.4% |
| IMR 3031 | <<locked>> | 80% | 32,474 psi | 56% | 2014 fps | 99.7% |
| IMR 4064 | <<locked>> | 86% | 36,332 psi | 63% | 2024 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 43,004 psi | 74% | 2054 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 34,577 psi | 60% | 2047 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 80% | 35,578 psi | 61% | 2008 fps | 97.2% |
| Lovex D073.4 | <<locked>> | 80% | 48,095 psi | 83% | 2201 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 39,233 psi | 68% | 2077 fps | 98.9% |
| Lovex D073.6 | <<locked>> | 80% | 31,459 psi | 54% | 1978 fps | 97.8% |
| Lovex S060 | <<locked>> | 80% | 34,969 psi | 60% | 1955 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 29,675 psi | 51% | 1909 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 47,326 psi | 82% | 2133 fps | 100% |
| Norma 201 | <<locked>> | 80% | 33,141 psi | 57% | 1965 fps | 96.6% |
| Norma 202 | <<locked>> | 80% | 32,866 psi | 57% | 1978 fps | 98.7% |
| Norma 203B | <<locked>> | 84% | 33,199 psi | 57% | 2011 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 86% | 35,099 psi | 61% | 2060 fps | 95.3% |
| Ramshot TAC | <<locked>> | 86% | 43,047 psi | 74% | 2133 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 34,229 psi | 59% | 2018 fps | 95.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 38,740 psi | 67% | 2047 fps | 96.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,454 psi | 44% | 1214 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 39,929 psi | 69% | 2080 fps | 99.2% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 47,863 psi | 83% | 2215 fps | 95.1% |
| ReloadSwiss RS 52 | 74.5 gr | 86% | 37,173 psi | 64% | 2136 fps | 95.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 29,109 psi | 50% | 1978 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 36,680 psi | 63% | 2011 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 80% | 31,473 psi | 54% | 1926 fps | 96% |
| Rottweil R 903 | <<locked>> | 88% | 32,256 psi | 56% | 2005 fps | 95.7% |
| Shooters World AR Plus | <<locked>> | 80% | 48,095 psi | 83% | 2201 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,459 psi | 54% | 1978 fps | 97.8% |
| Shooters World Precision | <<locked>> | 80% | 29,675 psi | 51% | 1909 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 42,264 psi | 73% | 2090 fps | 98.4% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 44,512 psi | 77% | 2162 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 34,214 psi | 59% | 2051 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 42,612 psi | 73% | 2093 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 40,596 psi | 70% | 2103 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 34,490 psi | 59% | 2014 fps | 95.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,012 psi | 60% | 1942 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,398 psi | 49% | 1837 fps | 98.4% |
| Somchem S321 | <<locked>> | 80% | 37,695 psi | 65% | 2070 fps | 98.1% |
| Somchem S335 | <<locked>> | 80% | 34,345 psi | 59% | 1949 fps | 99.4% |
| Somchem S341 | <<locked>> | 82% | 35,172 psi | 61% | 2021 fps | 95.5% |
| Somchem S355 | <<locked>> | 86% | 31,662 psi | 55% | 1975 fps | 95.1% |
| Somchem S365 | <<locked>> | 94% | 29,196 psi | 50% | 1985 fps | 95% |
| Vihtavuori N120 | <<locked>> | 80% | 49,269 psi | 85% | 2080 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 39,769 psi | 69% | 2008 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 34,925 psi | 60% | 1949 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 29,994 psi | 52% | 1926 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 31,038 psi | 54% | 1929 fps | 98.6% |
| Vihtavuori N150 | <<locked>> | 84% | 28,253 psi | 49% | 1886 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 35,404 psi | 61% | 2005 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 80% | 29,791 psi | 51% | 1919 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 35,520 psi | 61% | 2028 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 34,055 psi | 59% | 2034 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 31,299 psi | 54% | 1969 fps | 95% |
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 88 powders for .450 Rigby loaded with the .458 | 461gr | TWENTY-NINE SILENTIO. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,365 fps; across all powders the maximum-charge window runs from 1,329 fps to 2,365 fps. Accurate 4064 gives the best case fill at 100 %, and 88 of the 88 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (400 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 461.0 gr projectile in 0.458" calls for a 1:18.0 twist; slower twists will usually not stabilise this weight. Accurate 4064, Alliant Reloder- TS 15.5, Alliant Reloder-17 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. Alliant Power Pro 2000-MR, ReloadSwiss RS 52, Hodgdon LEVERevolution rank at the top here: for .450 Rigby with the .458 | 461gr | TWENTY-NINE SILENTIO 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.