Load Specifications
Bullet:.458 | 576gr | ACME SoCom
Bullet Manufacturer:ACME
Bullet Weight:576 gr
Bullet Diameter:0.458"
Bullet Length:<<locked>>
Caliber:.450 Rigby load data
Case Length (l3):2.902"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:133.01 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:58,015 psi
Load data in caliber .450 Rigby with .458 | 576gr | ACME SoCom bullet and 107 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance 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.
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>> | 82% | 52,402 psi | 90% | 2028 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 50,067 psi | 86% | 2044 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 50,270 psi | 87% | 2070 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,857 psi | 70% | 2041 fps | 98.4% |
| Accurate 4064 | <<locked>> | 88% | 50,473 psi | 87% | 2090 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 50,444 psi | 87% | 2172 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 45,295 psi | 78% | 2192 fps | 96.1% |
| ADI AR 2206H | <<locked>> | 84% | 51,706 psi | 89% | 2119 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 49,690 psi | 86% | 2087 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 49,530 psi | 85% | 2165 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 82% | 50,879 psi | 88% | 2080 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 51,764 psi | 89% | 2051 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 51,329 psi | 88% | 2221 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 49,066 psi | 85% | 2165 fps | 97.7% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 49,066 psi | 85% | 2165 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 49,516 psi | 85% | 2103 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 49,879 psi | 86% | 2119 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 52,388 psi | 90% | 2218 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 49,821 psi | 86% | 2201 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 48,327 psi | 83% | 2159 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 41,901 psi | 72% | 2106 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,334 psi | 68% | 2067 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 34,563 psi | 60% | 1998 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,005 psi | 76% | 2205 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 51,314 psi | 88% | 2139 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 49,400 psi | 85% | 2113 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 41,901 psi | 72% | 2106 fps | 96.3% |
| Bofors RP7 | <<locked>> | 92% | 50,024 psi | 86% | 2100 fps | 98.6% |
| Hodgdon BL-C2 | <<locked>> | 82% | 49,763 psi | 86% | 2103 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 50,546 psi | 87% | 2126 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 94% | 50,357 psi | 87% | 2178 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 92% | 51,256 psi | 88% | 2149 fps | 98.3% |
| Hodgdon H4895 | <<locked>> | 84% | 52,257 psi | 90% | 2126 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,996 psi | 90% | 2156 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 51,706 psi | 89% | 2159 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 50,357 psi | 87% | 2208 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,447 psi | 61% | 1266 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 50,227 psi | 87% | 2090 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 49,095 psi | 85% | 2067 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 52,315 psi | 90% | 2110 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 52,257 psi | 90% | 2100 fps | 99.2% |
| IMR 4350 | <<locked>> | 96% | 50,430 psi | 87% | 2126 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 52,127 psi | 90% | 2126 fps | 99.2% |
| IMR 4831 | <<locked>> | 98% | 51,372 psi | 89% | 2169 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 51,184 psi | 88% | 2139 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 49,443 psi | 85% | 2116 fps | 95.8% |
| IMR 8208 XBR | <<locked>> | 82% | 50,879 psi | 88% | 2080 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 51,039 psi | 88% | 2096 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 51,503 psi | 89% | 2064 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 51,880 psi | 89% | 2103 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 51,053 psi | 88% | 2116 fps | 99.7% |
| Lovex S070 | <<locked>> | 96% | 51,793 psi | 89% | 2149 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 33,765 psi | 58% | 1929 fps | 96.7% |
| Norma 201 | <<locked>> | 84% | 50,285 psi | 87% | 2073 fps | 100% |
| Norma 202 | <<locked>> | 84% | 50,981 psi | 88% | 2073 fps | 100% |
| Norma 203B | <<locked>> | 88% | 52,373 psi | 90% | 2146 fps | 100% |
| Norma 204 | <<locked>> | 96% | 50,488 psi | 87% | 2165 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 44,092 psi | 76% | 2169 fps | 98.2% |
| Norma URP | <<locked>> | 96% | 50,038 psi | 86% | 2165 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 49,516 psi | 85% | 2133 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 52,199 psi | 90% | 2208 fps | 99.7% |
| Ramshot TAC | <<locked>> | 82% | 50,807 psi | 88% | 2103 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 50,372 psi | 87% | 2113 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,955 psi | 62% | 1299 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 50,923 psi | 88% | 2116 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 50,328 psi | 87% | 2169 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 49,676 psi | 86% | 2198 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 50,328 psi | 87% | 2195 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 49,995 psi | 86% | 2218 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 51,068 psi | 88% | 2051 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 50,763 psi | 88% | 2073 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 49,458 psi | 85% | 2106 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 51,256 psi | 88% | 2146 fps | 96.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 47,021 psi | 81% | 2142 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 92% | 50,024 psi | 86% | 2100 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 51,053 psi | 88% | 2116 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 51,039 psi | 88% | 2096 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 51,880 psi | 89% | 2103 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 51,793 psi | 89% | 2149 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 51,401 psi | 89% | 2159 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 48,907 psi | 84% | 2083 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 50,227 psi | 87% | 2103 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 52,025 psi | 90% | 2021 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 52,286 psi | 90% | 2028 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 51,126 psi | 88% | 2083 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 46,572 psi | 80% | 2139 fps | 97.4% |
| Somchem S335 | <<locked>> | 84% | 51,343 psi | 89% | 2024 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 52,272 psi | 90% | 2116 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 50,053 psi | 86% | 2106 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,517 psi | 89% | 2205 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,427 psi | 82% | 2126 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 82% | 49,385 psi | 85% | 1978 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 50,821 psi | 88% | 2041 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 51,619 psi | 89% | 2060 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 51,387 psi | 89% | 2090 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 49,255 psi | 85% | 2123 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 40,857 psi | 70% | 2021 fps | 96.4% |
| Vihtavuori N530 | <<locked>> | 82% | 51,097 psi | 88% | 2077 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 49,574 psi | 85% | 2060 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 51,387 psi | 89% | 2169 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,439 psi | 75% | 2123 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 49,037 psi | 85% | 2106 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 51,169 psi | 88% | 2116 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 50,546 psi | 87% | 2182 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,882 psi | 60% | 2090 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 49,850 psi | 86% | 2106 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 44,556 psi | 77% | 2077 fps | 96.6% |
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% | 49,226 psi | 85% | 1991 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,901 psi | 71% | 1939 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 41,118 psi | 71% | 1946 fps | 96.6% |
| Accurate 3100 | <<locked>> | 92% | 30,777 psi | 53% | 1873 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 38,812 psi | 67% | 1942 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 28,456 psi | 49% | 1827 fps | 96.6% |
| Accurate High Country | <<locked>> | 98% | 42,279 psi | 73% | 2146 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 45,513 psi | 78% | 2041 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 38,653 psi | 67% | 1932 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 94% | 40,727 psi | 70% | 2037 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,747 psi | 82% | 2041 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 48,501 psi | 84% | 2014 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,481 psi | 72% | 2083 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 40,437 psi | 70% | 2037 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 40,437 psi | 70% | 2037 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,247 psi | 66% | 1949 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,075 psi | 71% | 1998 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 29,544 psi | 51% | 1847 fps | 97% |
| Alliant Reloder-17 | 84.5 gr | 80% | 32,793 psi | 57% | 1942 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 94% | 39,914 psi | 69% | 2031 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 39,218 psi | 68% | 2064 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 84% | 23,641 psi | 41% | 1739 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 96% | 30,472 psi | 53% | 1909 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 88% | 28,558 psi | 49% | 1909 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,817 psi | 77% | 2054 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 37,608 psi | 65% | 1952 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 39,218 psi | 68% | 2064 fps | 95.5% |
| Bofors RP7 | <<locked>> | 82% | 36,303 psi | 63% | 1896 fps | 95.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,369 psi | 80% | 2064 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,479 psi | 66% | 1959 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 82% | 33,373 psi | 58% | 1916 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 84% | 39,421 psi | 68% | 1978 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 45,948 psi | 79% | 2051 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,876 psi | 46% | 1768 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,105 psi | 73% | 2037 fps | 100% |
| Hodgdon Superformance | 93.8 gr | 84% | 35,027 psi | 60% | 1969 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,426 psi | 46% | 1129 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,164 psi | 76% | 2014 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 45,992 psi | 79% | 2031 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,582 psi | 70% | 1955 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,120 psi | 74% | 1978 fps | 97.9% |
| IMR 4350 | <<locked>> | 86% | 36,680 psi | 63% | 1926 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 35,694 psi | 62% | 1883 fps | 95.8% |
| IMR 4831 | <<locked>> | 80% | 27,992 psi | 48% | 1804 fps | 96.4% |
| IMR 4895 | <<locked>> | 80% | 42,134 psi | 73% | 2021 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 46,398 psi | 80% | 2073 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 47,747 psi | 82% | 2041 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,425 psi | 77% | 2018 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,556 psi | 79% | 1991 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 40,306 psi | 69% | 1955 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 32,779 psi | 56% | 1841 fps | 96.5% |
| Lovex S070 | <<locked>> | 82% | 33,069 psi | 57% | 1864 fps | 95.4% |
| Lovex S071 | <<locked>> | 96% | 29,385 psi | 51% | 1847 fps | 95% |
| Norma 201 | <<locked>> | 80% | 44,150 psi | 76% | 1998 fps | 100% |
| Norma 202 | <<locked>> | 80% | 44,918 psi | 77% | 2001 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,422 psi | 70% | 1988 fps | 99.9% |
| Norma 204 | <<locked>> | 90% | 41,191 psi | 71% | 2034 fps | 95.6% |
| Norma MRP | <<locked>> | 92% | 33,489 psi | 58% | 1985 fps | 95% |
| Norma URP | <<locked>> | 80% | 29,298 psi | 51% | 1837 fps | 96.7% |
| Ramshot Big Game | <<locked>> | 80% | 40,103 psi | 69% | 2005 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 30,618 psi | 53% | 1867 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 47,500 psi | 82% | 2060 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,137 psi | 81% | 2073 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,687 psi | 46% | 1158 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,986 psi | 67% | 1949 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,656 psi | 75% | 2083 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,027 psi | 60% | 1985 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 28,413 psi | 49% | 1844 fps | 96.1% |
| ReloadSwiss RS 70 | 85.8 gr | 80% | 28,674 psi | 49% | 1850 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 48,037 psi | 83% | 2014 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,018 psi | 72% | 1962 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 35,273 psi | 61% | 1909 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 96% | 44,991 psi | 78% | 2060 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 94% | 38,435 psi | 66% | 2014 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 82% | 36,303 psi | 63% | 1896 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 32,779 psi | 56% | 1841 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,425 psi | 77% | 2018 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,306 psi | 69% | 1955 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 33,069 psi | 57% | 1864 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,637 psi | 63% | 1955 fps | 99.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,556 psi | 79% | 2041 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,976 psi | 76% | 2021 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,876 psi | 79% | 1952 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,145 psi | 66% | 1857 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 34,229 psi | 59% | 1841 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 38,101 psi | 66% | 2011 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 45,237 psi | 78% | 1952 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,600 psi | 79% | 2037 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 36,201 psi | 62% | 1913 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 25,976 psi | 45% | 1798 fps | 98.6% |
| Somchem S385 | <<locked>> | 92% | 36,260 psi | 63% | 1959 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 46,427 psi | 80% | 1942 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,887 psi | 72% | 1939 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,496 psi | 73% | 1952 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,476 psi | 59% | 1864 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 30,690 psi | 53% | 1837 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 98% | 38,247 psi | 66% | 1978 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 47,877 psi | 83% | 2041 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,698 psi | 70% | 1949 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 29,979 psi | 52% | 1837 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 84% | 25,164 psi | 43% | 1791 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,371 psi | 52% | 1821 fps | 98.8% |
| Winchester 748 | <<locked>> | 80% | 47,630 psi | 82% | 2077 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 33,475 psi | 58% | 1919 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 23,351 psi | 40% | 1795 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,540 psi | 75% | 2028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 41,640 psi | 72% | 2034 fps | 95.8% |
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 107 powders for .450 Rigby loaded with the .458 | 576gr | ACME SoCom. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,221 fps; across all powders the maximum-charge window runs from 1,266 fps to 2,221 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (400 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. Accurate 3100, Accurate High Country, ADI AR 2209 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 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .450 Rigby with the .458 | 576gr | ACME SoCom 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.