Load Specifications
Load data in caliber .416 Taylor Mag. with .416 | 400gr | Nosler Solid bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon CFE223, Alliant Power Pro 1200-R and Alliant Power Pro 2000-MR.
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>> | 84% | 57,551 psi | 90% | 2087 fps | 100% |
| Accurate 2015 | <<locked>> | 96% | 56,478 psi | 89% | 2142 fps | 100% |
| Accurate 2200 | <<locked>> | 86% | 54,563 psi | 86% | 2182 fps | 98.7% |
| Accurate 2230 | <<locked>> | 86% | 55,056 psi | 86% | 2192 fps | 99% |
| Accurate 2460 | <<locked>> | 92% | 55,042 psi | 86% | 2165 fps | 100% |
| Accurate 2495ᴾ | <<locked>> | 100% | 51,822 psi | 81% | 2152 fps | 100% |
| Accurate 2520 | <<locked>> | 96% | 55,941 psi | 88% | 2211 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 48,066 psi | 75% | 2142 fps | 100% |
| Accurate LT-30 | <<locked>> | 88% | 54,998 psi | 86% | 2073 fps | 100% |
| Accurate LT-32 | <<locked>> | 88% | 55,434 psi | 87% | 2087 fps | 100% |
| ADI AR 2206H | <<locked>> | 98% | 55,245 psi | 87% | 2211 fps | 99.3% |
| ADI AR 2207 | <<locked>> | 86% | 55,883 psi | 88% | 2087 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 49,632 psi | 78% | 2126 fps | 98% |
| ADI AR 2219 | <<locked>> | 88% | 54,215 psi | 85% | 2169 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 96% | 55,071 psi | 86% | 2182 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 98% | 56,724 psi | 89% | 2198 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 92% | 56,246 psi | 88% | 2260 fps | 99.7% |
| Alliant Power Pro 2000-MRᴾ | <<locked>> | 100% | 54,868 psi | 86% | 2293 fps | 98.7% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 47,718 psi | 75% | 2142 fps | 99.1% |
| Alliant Reloder-10x | <<locked>> | 92% | 56,927 psi | 89% | 2152 fps | 100% |
| Alliant Reloder-15ᴾ | <<locked>> | 100% | 52,054 psi | 82% | 2195 fps | 98.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 42,569 psi | 67% | 2133 fps | 97.7% |
| Alliant Reloder-7 | <<locked>> | 86% | 56,985 psi | 89% | 2100 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 90% | 56,927 psi | 89% | 2113 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 98% | 54,766 psi | 86% | 2224 fps | 98.5% |
| Bofors RP3ᴾ | <<locked>> | 100% | 47,456 psi | 74% | 2149 fps | 99.2% |
| Hodgdon Benchmark | <<locked>> | 94% | 54,418 psi | 85% | 2133 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 98% | 56,565 psi | 89% | 2247 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 94% | 55,042 psi | 86% | 2277 fps | 99% |
| Hodgdon H322 | <<locked>> | 92% | 55,956 psi | 88% | 2185 fps | 100% |
| Hodgdon H335 | <<locked>> | 92% | 57,203 psi | 90% | 2211 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 49,777 psi | 78% | 2156 fps | 97.1% |
| Hodgdon H4198 | <<locked>> | 86% | 57,087 psi | 89% | 2106 fps | 100% |
| Hodgdon H4895 | <<locked>> | 98% | 55,593 psi | 87% | 2221 fps | 99.6% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 53,476 psi | 84% | 2241 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,794 psi | 53% | 1247 fps | 100% |
| Hodgdon VARGETᴾ | <<locked>> | 100% | 57,348 psi | 90% | 2221 fps | 99.7% |
| IMR 3031ᴾ | <<locked>> | 100% | 57,508 psi | 90% | 2244 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 52,228 psi | 82% | 2149 fps | 98.6% |
| IMR 4198 | <<locked>> | 90% | 54,607 psi | 86% | 2083 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 57,043 psi | 89% | 2047 fps | 100% |
| IMR 4895ᴾ | <<locked>> | 100% | 53,301 psi | 84% | 2221 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 96% | 55,071 psi | 86% | 2182 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 86% | 55,680 psi | 87% | 2178 fps | 100% |
| Lovex D073.5 | <<locked>> | 92% | 54,998 psi | 86% | 2175 fps | 100% |
| Lovex D073.6ᴾ | <<locked>> | 100% | 56,884 psi | 89% | 2231 fps | 100% |
| Lovex S053 | <<locked>> | 82% | 55,898 psi | 88% | 2001 fps | 100% |
| Lovex S060 | <<locked>> | 98% | 56,550 psi | 89% | 2159 fps | 99.3% |
| Lovex S062ᴾ | <<locked>> | 100% | 51,285 psi | 80% | 2152 fps | 99.6% |
| Norma 200 | <<locked>> | 88% | 56,971 psi | 89% | 2129 fps | 100% |
| Norma 201ᴾ | <<locked>> | 100% | 57,319 psi | 90% | 2205 fps | 99.9% |
| Norma 202ᴾ | <<locked>> | 100% | 57,348 psi | 90% | 2211 fps | 100% |
| Norma 203Bᴾ | <<locked>> | 100% | 51,126 psi | 80% | 2185 fps | 98.9% |
| Ramshot Big Gameᴾ | <<locked>> | 100% | 51,750 psi | 81% | 2208 fps | 98.8% |
| Ramshot TAC | <<locked>> | 96% | 55,927 psi | 88% | 2192 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 96% | 54,157 psi | 85% | 2208 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 94% | 57,174 psi | 90% | 2188 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,910 psi | 53% | 1276 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 57,319 psi | 90% | 2080 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 92% | 55,172 psi | 86% | 2175 fps | 100% |
| ReloadSwiss RS 52ᴾ | <<locked>> | 100% | 55,143 psi | 86% | 2287 fps | 99% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 45,585 psi | 71% | 2188 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 96% | 55,216 psi | 87% | 2159 fps | 100% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 54,041 psi | 85% | 2162 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 44,193 psi | 69% | 2100 fps | 98.5% |
| Shooters World AR Plus | <<locked>> | 86% | 55,680 psi | 87% | 2178 fps | 100% |
| Shooters World Match Rifleᴾ | <<locked>> | 100% | 56,884 psi | 89% | 2231 fps | 100% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 51,285 psi | 80% | 2152 fps | 99.6% |
| Shooters World Tactical Rifle | <<locked>> | 90% | 55,869 psi | 88% | 2152 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 56,086 psi | 88% | 1880 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 88% | 54,389 psi | 85% | 2175 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 46,644 psi | 73% | 2149 fps | 98.1% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 54,563 psi | 86% | 2129 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 98% | 57,072 psi | 89% | 2208 fps | 98% |
| SNPE Vectan SP 9ᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2231 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 98% | 57,130 psi | 90% | 2129 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 49,327 psi | 77% | 2057 fps | 100% |
| Somchem S321 | <<locked>> | 94% | 56,391 psi | 88% | 2215 fps | 99.9% |
| Somchem S335 | <<locked>> | 98% | 55,477 psi | 87% | 2129 fps | 100% |
| Somchem S341 | <<locked>> | 98% | 56,144 psi | 88% | 2205 fps | 99.2% |
| Somchem S355ᴾ | <<locked>> | 100% | 45,484 psi | 71% | 2103 fps | 98.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 32,590 psi | 51% | 1962 fps | 96.2% |
| Vihtavuori N120 | <<locked>> | 86% | 55,811 psi | 87% | 2044 fps | 100% |
| Vihtavuori N130 | <<locked>> | 94% | 57,130 psi | 90% | 2110 fps | 100% |
| Vihtavuori N133 | <<locked>> | 98% | 56,507 psi | 89% | 2119 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 52,286 psi | 82% | 2142 fps | 100% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 54,491 psi | 85% | 2159 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 43,816 psi | 69% | 2057 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 96% | 55,724 psi | 87% | 2182 fps | 99.8% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 52,547 psi | 82% | 2162 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 40,509 psi | 63% | 2008 fps | 97% |
| Winchester 748 | <<locked>> | 98% | 57,363 psi | 90% | 2254 fps | 100% |
| Winchester StaBALL Matchᴾ | <<locked>> | 100% | 56,420 psi | 88% | 2238 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% | 50,560 psi | 79% | 2018 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 34,650 psi | 54% | 1870 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 44,831 psi | 70% | 2054 fps | 97.1% |
| Accurate 2230 | <<locked>> | 80% | 44,672 psi | 70% | 2064 fps | 97.5% |
| Accurate 2460 | <<locked>> | 80% | 37,028 psi | 58% | 1936 fps | 99.2% |
| Accurate 2495 | <<locked>> | 80% | 27,079 psi | 42% | 1795 fps | 99.4% |
| Accurate 2520 | <<locked>> | 80% | 32,590 psi | 51% | 1896 fps | 98% |
| Accurate 4064 | <<locked>> | 80% | 25,686 psi | 40% | 1775 fps | 96.9% |
| Accurate LT-30 | <<locked>> | 80% | 43,221 psi | 68% | 1932 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 43,598 psi | 68% | 1946 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 82% | 33,808 psi | 53% | 1900 fps | 95% |
| ADI AR 2207 | <<locked>> | 80% | 46,630 psi | 73% | 1988 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 36,869 psi | 58% | 1939 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 41,568 psi | 65% | 2014 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 33,707 psi | 53% | 1877 fps | 96.4% |
| Alliant AR-Comp | <<locked>> | 80% | 31,705 psi | 50% | 1886 fps | 100% |
| Alliant Power Pro 1200-R | 49.6 gr | 80% | 38,290 psi | 60% | 2014 fps | 97.3% |
| Alliant Power Pro 2000-MR | 59.4 gr | 90% | 39,508 psi | 62% | 2067 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 30,995 psi | 49% | 1877 fps | 95.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 39,711 psi | 62% | 1949 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 35,911 psi | 56% | 1959 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 94% | 35,215 psi | 55% | 2001 fps | 95.3% |
| Alliant Reloder-7 | <<locked>> | 80% | 47,630 psi | 75% | 1998 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 41,539 psi | 65% | 1936 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 39,740 psi | 62% | 2018 fps | 95.4% |
| Bofors RP3 | <<locked>> | 86% | 29,994 psi | 47% | 1873 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 35,998 psi | 56% | 1880 fps | 97.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 30,966 psi | 49% | 1880 fps | 96.3% |
| Hodgdon CFE223 | 55.4 gr | 82% | 36,796 psi | 58% | 2011 fps | 95.2% |
| Hodgdon H322 | <<locked>> | 80% | 38,029 psi | 60% | 1962 fps | 99.8% |
| Hodgdon H335 | <<locked>> | 80% | 38,464 psi | 60% | 1978 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 94% | 40,930 psi | 64% | 2034 fps | 95% |
| Hodgdon H4198 | <<locked>> | 80% | 47,601 psi | 75% | 2001 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 31,937 psi | 50% | 1870 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 32,271 psi | 51% | 1916 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,990 psi | 39% | 1109 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 32,924 psi | 52% | 1873 fps | 95.2% |
| IMR 3031 | <<locked>> | 80% | 30,400 psi | 48% | 1877 fps | 99.4% |
| IMR 4064 | <<locked>> | 88% | 36,289 psi | 57% | 1923 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 40,799 psi | 64% | 1923 fps | 100% |
| IMR 4227 | <<locked>> | 80% | 53,853 psi | 84% | 2014 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 34,505 psi | 54% | 1946 fps | 95.5% |
| IMR 8208 XBR | <<locked>> | 80% | 33,707 psi | 53% | 1877 fps | 96.4% |
| Lovex D073.4 | <<locked>> | 80% | 45,237 psi | 71% | 2054 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 36,869 psi | 58% | 1936 fps | 98.3% |
| Lovex D073.6 | <<locked>> | 80% | 29,283 psi | 46% | 1844 fps | 97% |
| Lovex S053 | <<locked>> | 80% | 52,562 psi | 82% | 1969 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 35,215 psi | 55% | 1864 fps | 95.4% |
| Lovex S062 | <<locked>> | 82% | 29,617 psi | 46% | 1818 fps | 95.1% |
| Norma 200 | <<locked>> | 80% | 44,730 psi | 70% | 1995 fps | 100% |
| Norma 201 | <<locked>> | 80% | 31,183 psi | 49% | 1831 fps | 95.7% |
| Norma 202 | <<locked>> | 80% | 30,792 psi | 48% | 1844 fps | 98.1% |
| Norma 203B | <<locked>> | 88% | 35,201 psi | 55% | 1952 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 88% | 35,172 psi | 55% | 1959 fps | 95% |
| Ramshot TAC | <<locked>> | 90% | 46,180 psi | 72% | 2070 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 34,418 psi | 54% | 1923 fps | 95.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 36,579 psi | 57% | 1909 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,034 psi | 39% | 1138 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 53,998 psi | 85% | 2047 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 37,710 psi | 59% | 1946 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 37,130 psi | 58% | 2031 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 29,269 psi | 46% | 1880 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 34,650 psi | 54% | 1877 fps | 98.7% |
| Rottweil R 902 | <<locked>> | 80% | 29,718 psi | 47% | 1798 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 90% | 31,865 psi | 50% | 1903 fps | 95.3% |
| Shooters World AR Plus | <<locked>> | 80% | 45,237 psi | 71% | 2054 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 29,283 psi | 46% | 1844 fps | 97% |
| Shooters World Precision | <<locked>> | 82% | 29,617 psi | 46% | 1818 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 39,972 psi | 63% | 1952 fps | 97.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 48,167 psi | 75% | 1801 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 42,076 psi | 66% | 2021 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 36,245 psi | 57% | 1985 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 40,277 psi | 63% | 1955 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 43,497 psi | 68% | 2044 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 34,432 psi | 54% | 1913 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,170 psi | 52% | 1818 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 26,861 psi | 42% | 1716 fps | 97.7% |
| Somchem S321 | <<locked>> | 80% | 35,404 psi | 55% | 1932 fps | 97.3% |
| Somchem S335 | <<locked>> | 80% | 32,445 psi | 51% | 1821 fps | 99% |
| Somchem S341 | <<locked>> | 84% | 35,346 psi | 55% | 1923 fps | 95.3% |
| Somchem S355 | <<locked>> | 90% | 33,402 psi | 52% | 1913 fps | 95.6% |
| Somchem S365 | <<locked>> | 98% | 30,792 psi | 48% | 1923 fps | 95.4% |
| Vihtavuori N120 | <<locked>> | 80% | 46,688 psi | 73% | 1949 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 37,739 psi | 59% | 1880 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 33,025 psi | 52% | 1824 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 80% | 28,021 psi | 44% | 1798 fps | 99.5% |
| Vihtavuori N140 | <<locked>> | 80% | 29,182 psi | 46% | 1798 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 86% | 28,210 psi | 44% | 1795 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 33,315 psi | 52% | 1870 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 80% | 27,891 psi | 44% | 1788 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 35,607 psi | 56% | 1926 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 32,010 psi | 50% | 1896 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 33,504 psi | 53% | 1916 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 93 powders for .416 Taylor Mag. loaded with the .416 | 400gr | Nosler Solid. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,293 fps; across all powders the maximum-charge window runs from 1,247 fps to 2,293 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 (440 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 400.0 gr projectile in 0.416" calls for a 1:20.0 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. Hodgdon CFE223, Alliant Power Pro 1200-R, Alliant Power Pro 2000-MR rank at the top here: for .416 Taylor Mag. with the .416 | 400gr | Nosler Solid 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.