Load Specifications
Load data in caliber .458 Lott with .458 | 500gr | Nosler Partition PP bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 4895, Hodgdon CFE223 and Alliant Power Pro 1200-R.
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 1680 | <<locked>> | 82% | 55,796 psi | 89% | 2041 fps | 100% |
| Accurate 2015 | <<locked>> | 94% | 55,288 psi | 89% | 2096 fps | 100% |
| Accurate 2200 | <<locked>> | 84% | 52,939 psi | 85% | 2133 fps | 98.8% |
| Accurate 2230 | <<locked>> | 84% | 53,519 psi | 86% | 2146 fps | 99.1% |
| Accurate 2460 | <<locked>> | 90% | 53,867 psi | 86% | 2123 fps | 100% |
| Accurate 2495ᴾ | <<locked>> | 100% | 54,360 psi | 87% | 2142 fps | 100% |
| Accurate 2520 | <<locked>> | 94% | 54,650 psi | 88% | 2165 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 50,401 psi | 81% | 2136 fps | 100% |
| Accurate LT-30 | <<locked>> | 86% | 53,519 psi | 86% | 2028 fps | 100% |
| Accurate LT-32 | <<locked>> | 86% | 53,954 psi | 87% | 2044 fps | 100% |
| ADI AR 2206H | <<locked>> | 96% | 54,027 psi | 87% | 2169 fps | 99.4% |
| ADI AR 2207 | <<locked>> | 84% | 54,563 psi | 87% | 2041 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 51,561 psi | 83% | 2123 fps | 98.6% |
| ADI AR 2219 | <<locked>> | 88% | 56,333 psi | 90% | 2156 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 94% | 53,708 psi | 86% | 2136 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 96% | 55,666 psi | 89% | 2152 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 90% | 54,911 psi | 88% | 2215 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 98% | 53,345 psi | 86% | 2247 fps | 98.8% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 49,966 psi | 80% | 2136 fps | 99.5% |
| Alliant Reloder-10x | <<locked>> | 90% | 55,695 psi | 89% | 2106 fps | 100% |
| Alliant Reloder-15ᴾ | <<locked>> | 100% | 54,505 psi | 87% | 2192 fps | 99.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 44,280 psi | 71% | 2133 fps | 98.5% |
| Alliant Reloder-7 | <<locked>> | 84% | 55,666 psi | 89% | 2054 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 55,245 psi | 89% | 2064 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 96% | 53,505 psi | 86% | 2178 fps | 98.6% |
| Bofors RP3ᴾ | <<locked>> | 100% | 49,748 psi | 80% | 2149 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 92% | 53,229 psi | 85% | 2090 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 96% | 55,172 psi | 88% | 2201 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 92% | 53,606 psi | 86% | 2231 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 90% | 54,752 psi | 88% | 2139 fps | 100% |
| Hodgdon H335 | <<locked>> | 90% | 55,550 psi | 89% | 2162 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 51,909 psi | 83% | 2152 fps | 97.8% |
| Hodgdon H4198 | <<locked>> | 84% | 55,477 psi | 89% | 2060 fps | 100% |
| Hodgdon H4895 | <<locked>> | 96% | 54,389 psi | 87% | 2175 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 35,404 psi | 57% | 1932 fps | 96.1% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 55,898 psi | 90% | 2238 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,895 psi | 54% | 1230 fps | 100% |
| Hodgdon VARGET | <<locked>> | 98% | 56,101 psi | 90% | 2178 fps | 99.7% |
| IMR 3031 | <<locked>> | 98% | 56,275 psi | 90% | 2198 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 54,302 psi | 87% | 2146 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 98% | 56,130 psi | 90% | 2133 fps | 96.1% |
| IMR 4198 | <<locked>> | 90% | 56,376 psi | 90% | 2070 fps | 100% |
| IMR 4895ᴾ | <<locked>> | 100% | 55,796 psi | 89% | 2218 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 94% | 53,708 psi | 86% | 2136 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 84% | 54,172 psi | 87% | 2129 fps | 100% |
| Lovex D073.5 | <<locked>> | 90% | 53,606 psi | 86% | 2129 fps | 100% |
| Lovex D073.6 | <<locked>> | 98% | 55,796 psi | 89% | 2188 fps | 100% |
| Lovex S060 | <<locked>> | 96% | 55,027 psi | 88% | 2113 fps | 99.4% |
| Lovex S062ᴾ | <<locked>> | 100% | 53,287 psi | 85% | 2146 fps | 99.9% |
| Norma 200 | <<locked>> | 86% | 55,840 psi | 90% | 2087 fps | 100% |
| Norma 201 | <<locked>> | 98% | 56,086 psi | 90% | 2162 fps | 99.9% |
| Norma 202 | <<locked>> | 98% | 56,217 psi | 90% | 2169 fps | 100% |
| Norma 203Bᴾ | <<locked>> | 100% | 53,476 psi | 86% | 2185 fps | 99.4% |
| Ramshot Big Gameᴾ | <<locked>> | 100% | 53,954 psi | 87% | 2205 fps | 99.3% |
| Ramshot TAC | <<locked>> | 94% | 54,520 psi | 87% | 2149 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 94% | 52,982 psi | 85% | 2162 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 92% | 55,535 psi | 89% | 2142 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,084 psi | 55% | 1263 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 90% | 53,838 psi | 86% | 2129 fps | 100% |
| ReloadSwiss RS 50ᴾ | <<locked>> | 100% | 53,026 psi | 85% | 2139 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 98% | 53,911 psi | 86% | 2244 fps | 99.2% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 47,369 psi | 76% | 2185 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 54,056 psi | 87% | 2116 fps | 100% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 56,188 psi | 90% | 2156 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 46,195 psi | 74% | 2096 fps | 99% |
| Shooters World AR Plus | <<locked>> | 84% | 54,172 psi | 87% | 2129 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 98% | 55,796 psi | 89% | 2188 fps | 100% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 53,287 psi | 85% | 2146 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 88% | 54,157 psi | 87% | 2106 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 54,810 psi | 88% | 1837 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 53,113 psi | 85% | 2129 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 48,617 psi | 78% | 2149 fps | 98.7% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 53,447 psi | 86% | 2087 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 96% | 55,767 psi | 89% | 2169 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 98% | 55,724 psi | 89% | 2185 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 96% | 55,666 psi | 89% | 2087 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 51,184 psi | 82% | 2047 fps | 100% |
| Somchem S321 | <<locked>> | 92% | 54,882 psi | 88% | 2169 fps | 100% |
| Somchem S335 | <<locked>> | 96% | 54,128 psi | 87% | 2087 fps | 100% |
| Somchem S341 | <<locked>> | 96% | 54,839 psi | 88% | 2162 fps | 99.3% |
| Somchem S355ᴾ | <<locked>> | 100% | 47,514 psi | 76% | 2100 fps | 99% |
| Somchem S365ᴾ | <<locked>> | 100% | 34,098 psi | 55% | 1969 fps | 97.3% |
| Vihtavuori N120 | <<locked>> | 84% | 54,505 psi | 87% | 1998 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 55,579 psi | 89% | 2064 fps | 100% |
| Vihtavuori N133 | <<locked>> | 96% | 55,216 psi | 89% | 2073 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 54,578 psi | 88% | 2133 fps | 100% |
| Vihtavuori N140 | <<locked>> | 98% | 53,185 psi | 85% | 2113 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 45,716 psi | 73% | 2051 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 94% | 54,418 psi | 87% | 2136 fps | 99.9% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 54,665 psi | 88% | 2152 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 42,076 psi | 67% | 2008 fps | 97.8% |
| Winchester 748 | <<locked>> | 96% | 56,130 psi | 90% | 2208 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 98% | 55,071 psi | 88% | 2192 fps | 99.7% |
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 1680 | <<locked>> | 80% | 52,315 psi | 84% | 2005 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 35,984 psi | 58% | 1860 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 46,499 psi | 75% | 2051 fps | 97.8% |
| Accurate 2230 | <<locked>> | 80% | 46,383 psi | 74% | 2057 fps | 98.1% |
| Accurate 2460 | <<locked>> | 80% | 38,769 psi | 62% | 1932 fps | 99.6% |
| Accurate 2495 | <<locked>> | 80% | 28,485 psi | 46% | 1791 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 34,011 psi | 55% | 1893 fps | 98.6% |
| Accurate 4064 | <<locked>> | 80% | 26,992 psi | 43% | 1775 fps | 97.8% |
| Accurate LT-30 | <<locked>> | 80% | 44,556 psi | 71% | 1923 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 44,933 psi | 72% | 1936 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 80% | 33,011 psi | 53% | 1857 fps | 95.2% |
| ADI AR 2207 | <<locked>> | 80% | 48,341 psi | 78% | 1975 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 36,027 psi | 58% | 1900 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 43,250 psi | 69% | 2005 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 34,954 psi | 56% | 1873 fps | 97.2% |
| Alliant AR-Comp | <<locked>> | 80% | 33,170 psi | 53% | 1880 fps | 100% |
| Alliant Power Pro 1200-R | 61.1 gr | 80% | 39,827 psi | 64% | 2011 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 38,522 psi | 62% | 2024 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 30,400 psi | 49% | 1837 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 41,046 psi | 66% | 1936 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 35,273 psi | 57% | 1919 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 92% | 34,360 psi | 55% | 1962 fps | 95.6% |
| Alliant Reloder-7 | <<locked>> | 80% | 49,298 psi | 79% | 1988 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 43,091 psi | 69% | 1929 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 38,696 psi | 62% | 1975 fps | 95.6% |
| Bofors RP3 | <<locked>> | 84% | 29,472 psi | 47% | 1834 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 37,304 psi | 60% | 1873 fps | 98.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 32,372 psi | 52% | 1880 fps | 97.2% |
| Hodgdon CFE223 | 66.6 gr | 80% | 35,839 psi | 57% | 1969 fps | 95.4% |
| Hodgdon H322 | <<locked>> | 80% | 39,508 psi | 63% | 1955 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 40,001 psi | 64% | 1972 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 92% | 40,089 psi | 64% | 1995 fps | 95.3% |
| Hodgdon H4198 | <<locked>> | 80% | 49,095 psi | 79% | 1991 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 33,156 psi | 53% | 1867 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 33,315 psi | 53% | 1893 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 31,430 psi | 50% | 1873 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,193 psi | 40% | 1099 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 32,140 psi | 52% | 1834 fps | 95.4% |
| IMR 3031 | <<locked>> | 80% | 31,676 psi | 51% | 1873 fps | 99.7% |
| IMR 4064 | <<locked>> | 86% | 35,592 psi | 57% | 1886 fps | 95.5% |
| IMR 4166 Enduron | <<locked>> | 96% | 52,620 psi | 84% | 2093 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 42,308 psi | 68% | 1913 fps | 100% |
| IMR 4895 | 64.2 gr | 84% | 33,881 psi | 54% | 1906 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 80% | 34,954 psi | 56% | 1873 fps | 97.2% |
| Lovex D073.4 | <<locked>> | 80% | 47,166 psi | 76% | 2051 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 38,479 psi | 62% | 1936 fps | 98.8% |
| Lovex D073.6 | <<locked>> | 80% | 30,734 psi | 49% | 1844 fps | 97.8% |
| Lovex S060 | <<locked>> | 80% | 34,287 psi | 55% | 1821 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 28,993 psi | 46% | 1778 fps | 95.3% |
| Norma 200 | <<locked>> | 80% | 46,441 psi | 74% | 1985 fps | 100% |
| Norma 201 | <<locked>> | 80% | 32,460 psi | 52% | 1831 fps | 96.6% |
| Norma 202 | <<locked>> | 80% | 32,213 psi | 52% | 1844 fps | 98.7% |
| Norma 203B | <<locked>> | 84% | 32,489 psi | 52% | 1877 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 86% | 34,360 psi | 55% | 1919 fps | 95.2% |
| Ramshot TAC | <<locked>> | 88% | 45,020 psi | 72% | 2028 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 33,533 psi | 54% | 1880 fps | 95.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 37,884 psi | 61% | 1906 fps | 96.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,324 psi | 41% | 1125 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 39,204 psi | 63% | 1939 fps | 99.2% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 46,760 psi | 75% | 2060 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 36,289 psi | 58% | 1988 fps | 95.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 28,572 psi | 46% | 1841 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 35,882 psi | 58% | 1870 fps | 99.2% |
| Rottweil R 902 | <<locked>> | 80% | 30,864 psi | 49% | 1795 fps | 96% |
| Rottweil R 903 | <<locked>> | 88% | 31,488 psi | 50% | 1867 fps | 95.6% |
| Shooters World AR Plus | <<locked>> | 80% | 47,166 psi | 76% | 2051 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 30,734 psi | 49% | 1844 fps | 97.8% |
| Shooters World Precision | <<locked>> | 80% | 28,993 psi | 46% | 1778 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 41,495 psi | 67% | 1949 fps | 98.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 49,284 psi | 79% | 1785 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 43,642 psi | 70% | 2014 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 35,578 psi | 57% | 1949 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 41,829 psi | 67% | 1949 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 42,424 psi | 68% | 2001 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 33,721 psi | 54% | 1873 fps | 95.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 34,389 psi | 55% | 1811 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 27,847 psi | 45% | 1713 fps | 98.4% |
| Somchem S321 | <<locked>> | 80% | 36,999 psi | 59% | 1932 fps | 98.1% |
| Somchem S335 | <<locked>> | 80% | 33,692 psi | 54% | 1814 fps | 99.4% |
| Somchem S341 | <<locked>> | 82% | 34,461 psi | 55% | 1883 fps | 95.5% |
| Somchem S355 | <<locked>> | 86% | 30,966 psi | 50% | 1841 fps | 95.1% |
| Somchem S365 | <<locked>> | 96% | 30,153 psi | 48% | 1886 fps | 95.7% |
| Vihtavuori N120 | <<locked>> | 80% | 48,298 psi | 77% | 1936 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 39,073 psi | 63% | 1870 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 34,272 psi | 55% | 1814 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 29,312 psi | 47% | 1795 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 30,356 psi | 49% | 1795 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 84% | 27,688 psi | 44% | 1759 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 34,679 psi | 56% | 1867 fps | 97.2% |
| Vihtavuori N540 | <<locked>> | 80% | 29,095 psi | 47% | 1785 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 34,780 psi | 56% | 1890 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 33,301 psi | 53% | 1896 fps | 97.7% |
| Winchester StaBALL Match | <<locked>> | 82% | 32,605 psi | 52% | 1873 fps | 95.7% |
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 93 powders for .458 Lott loaded with the .458 | 500gr | Nosler Partition PP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,247 fps; across all powders the maximum-charge window runs from 1,230 fps to 2,247 fps. Accurate 2495 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 500.0 gr projectile in 0.458" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, ADI AR 2208 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. IMR 4895, Hodgdon CFE223, Alliant Power Pro 1200-R rank at the top here: for .458 Lott with the .458 | 500gr | Nosler Partition PP they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.