Load Specifications
Load data in caliber .416 Taylor Mag. with .416 | 400gr | Speer AGS SP 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.
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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 1680 | <<locked>> | 82% | 55,027 psi | 86% | 2073 fps | 100% |
| Accurate 2015 | <<locked>> | 94% | 54,462 psi | 85% | 2133 fps | 100% |
| Accurate 2200 | <<locked>> | 86% | 55,709 psi | 87% | 2208 fps | 98.9% |
| Accurate 2230 | <<locked>> | 86% | 56,434 psi | 88% | 2221 fps | 99.2% |
| Accurate 2460 | <<locked>> | 92% | 56,797 psi | 89% | 2195 fps | 100% |
| Accurate 2495ᴾ | <<locked>> | 100% | 53,461 psi | 84% | 2178 fps | 100% |
| Accurate 2520 | <<locked>> | 96% | 57,653 psi | 90% | 2241 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 49,574 psi | 78% | 2169 fps | 100% |
| Accurate LT-30 | <<locked>> | 88% | 56,057 psi | 88% | 2096 fps | 100% |
| Accurate LT-32 | <<locked>> | 88% | 56,492 psi | 89% | 2113 fps | 100% |
| ADI AR 2206H | <<locked>> | 98% | 56,594 psi | 89% | 2241 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 86% | 57,014 psi | 89% | 2106 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 51,097 psi | 80% | 2159 fps | 98.4% |
| ADI AR 2219 | <<locked>> | 88% | 55,564 psi | 87% | 2192 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 96% | 56,478 psi | 89% | 2208 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 96% | 54,926 psi | 86% | 2192 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 92% | 57,740 psi | 90% | 2290 fps | 99.9% |
| Alliant Power Pro 2000-MRᴾ | <<locked>> | 100% | 56,420 psi | 88% | 2326 fps | 99% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 49,298 psi | 77% | 2172 fps | 99.4% |
| Alliant Reloder-10x | <<locked>> | 90% | 54,839 psi | 86% | 2142 fps | 100% |
| Alliant Reloder-15ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 2228 fps | 99% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 43,685 psi | 68% | 2162 fps | 98.2% |
| Alliant Reloder-7 | <<locked>> | 84% | 54,998 psi | 86% | 2090 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 54,578 psi | 86% | 2100 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 98% | 56,420 psi | 88% | 2257 fps | 98.8% |
| Bofors RP3ᴾ | <<locked>> | 100% | 49,037 psi | 77% | 2182 fps | 99.4% |
| Hodgdon Benchmark | <<locked>> | 94% | 55,854 psi | 88% | 2162 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 96% | 54,505 psi | 85% | 2238 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 94% | 56,565 psi | 89% | 2310 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 92% | 57,580 psi | 90% | 2215 fps | 100% |
| Hodgdon H335 | <<locked>> | 90% | 54,998 psi | 86% | 2201 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 51,256 psi | 80% | 2188 fps | 97.5% |
| Hodgdon H4198 | <<locked>> | 84% | 54,969 psi | 86% | 2096 fps | 100% |
| Hodgdon H4895 | <<locked>> | 98% | 56,971 psi | 89% | 2247 fps | 99.8% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 55,172 psi | 86% | 2274 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,808 psi | 53% | 1257 fps | 100% |
| Hodgdon VARGET | <<locked>> | 98% | 55,288 psi | 87% | 2211 fps | 99.6% |
| IMR 3031 | <<locked>> | 98% | 55,376 psi | 87% | 2234 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 53,838 psi | 84% | 2182 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 98% | 55,579 psi | 87% | 2165 fps | 95.8% |
| IMR 4198 | <<locked>> | 90% | 55,695 psi | 87% | 2106 fps | 100% |
| IMR 4895ᴾ | <<locked>> | 100% | 54,897 psi | 86% | 2254 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 96% | 56,478 psi | 89% | 2208 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 86% | 57,029 psi | 89% | 2205 fps | 100% |
| Lovex D073.5 | <<locked>> | 92% | 56,724 psi | 89% | 2205 fps | 100% |
| Lovex D073.6 | <<locked>> | 98% | 54,853 psi | 86% | 2221 fps | 100% |
| Lovex S053 | <<locked>> | 82% | 56,826 psi | 89% | 2021 fps | 100% |
| Lovex S060 | <<locked>> | 96% | 54,418 psi | 85% | 2149 fps | 99.3% |
| Lovex S062ᴾ | <<locked>> | 100% | 52,591 psi | 82% | 2178 fps | 99.8% |
| Norma 200 | <<locked>> | 86% | 54,926 psi | 86% | 2119 fps | 100% |
| Norma 201 | <<locked>> | 98% | 55,361 psi | 87% | 2198 fps | 99.9% |
| Norma 202 | <<locked>> | 98% | 55,434 psi | 87% | 2205 fps | 100% |
| Norma 203Bᴾ | <<locked>> | 100% | 52,620 psi | 82% | 2218 fps | 99.2% |
| Ramshot Big Gameᴾ | <<locked>> | 100% | 53,185 psi | 83% | 2241 fps | 99.1% |
| Ramshot TAC | <<locked>> | 96% | 57,508 psi | 90% | 2224 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 96% | 55,898 psi | 88% | 2241 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 92% | 54,882 psi | 86% | 2178 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,142 psi | 54% | 1289 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 92% | 56,681 psi | 89% | 2201 fps | 100% |
| ReloadSwiss RS 50ᴾ | <<locked>> | 100% | 52,460 psi | 82% | 2172 fps | 96% |
| ReloadSwiss RS 52ᴾ | <<locked>> | 100% | 56,724 psi | 89% | 2320 fps | 99.3% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 46,688 psi | 73% | 2218 fps | 100% |
| Rottweil R 901 | <<locked>> | 96% | 56,478 psi | 89% | 2185 fps | 100% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 2192 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 45,498 psi | 71% | 2129 fps | 98.8% |
| Shooters World AR Plus | <<locked>> | 86% | 57,029 psi | 89% | 2205 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 98% | 54,853 psi | 86% | 2221 fps | 100% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 52,591 psi | 82% | 2178 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 90% | 57,246 psi | 90% | 2182 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 57,014 psi | 89% | 1896 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 88% | 55,898 psi | 88% | 2205 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 47,863 psi | 75% | 2178 fps | 98.5% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 55,854 psi | 88% | 2152 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 96% | 54,810 psi | 86% | 2198 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 98% | 55,027 psi | 86% | 2221 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 96% | 55,216 psi | 87% | 2123 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 50,691 psi | 79% | 2083 fps | 100% |
| Somchem S321 | <<locked>> | 92% | 54,157 psi | 85% | 2205 fps | 99.9% |
| Somchem S335 | <<locked>> | 98% | 56,840 psi | 89% | 2156 fps | 100% |
| Somchem S341 | <<locked>> | 96% | 54,041 psi | 85% | 2198 fps | 99.2% |
| Somchem S355ᴾ | <<locked>> | 100% | 46,731 psi | 73% | 2133 fps | 98.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 33,634 psi | 53% | 1998 fps | 96.9% |
| Vihtavuori N120 | <<locked>> | 86% | 56,956 psi | 89% | 2064 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 55,143 psi | 86% | 2103 fps | 100% |
| Vihtavuori N133 | <<locked>> | 96% | 54,723 psi | 86% | 2113 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 53,925 psi | 85% | 2169 fps | 100% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 55,854 psi | 88% | 2185 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 45,034 psi | 71% | 2083 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 96% | 57,087 psi | 89% | 2208 fps | 99.9% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 53,983 psi | 85% | 2188 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 41,553 psi | 65% | 2037 fps | 97.5% |
| Winchester 748 | <<locked>> | 96% | 55,361 psi | 87% | 2247 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 98% | 54,288 psi | 85% | 2228 fps | 99.6% |
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 1680 | <<locked>> | 80% | 51,634 psi | 81% | 2041 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 35,578 psi | 56% | 1893 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 46,050 psi | 72% | 2087 fps | 97.5% |
| Accurate 2230 | <<locked>> | 80% | 45,818 psi | 72% | 2090 fps | 97.9% |
| Accurate 2460 | <<locked>> | 80% | 38,058 psi | 60% | 1962 fps | 99.4% |
| Accurate 2495 | <<locked>> | 80% | 27,992 psi | 44% | 1821 fps | 99.6% |
| Accurate 2520 | <<locked>> | 80% | 33,620 psi | 53% | 1926 fps | 98.4% |
| Accurate 4064 | <<locked>> | 80% | 26,498 psi | 42% | 1801 fps | 97.4% |
| Accurate LT-30 | <<locked>> | 80% | 44,135 psi | 69% | 1959 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 44,527 psi | 70% | 1972 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 34,737 psi | 54% | 1929 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 47,834 psi | 75% | 2011 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 37,840 psi | 59% | 1969 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 42,728 psi | 67% | 2041 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 34,505 psi | 54% | 1903 fps | 96.9% |
| Alliant AR-Comp | <<locked>> | 80% | 32,619 psi | 51% | 1909 fps | 100% |
| Alliant Power Pro 1200-R | 50.9 gr | 80% | 39,276 psi | 62% | 2044 fps | 97.7% |
| Alliant Power Pro 2000-MR | 61 gr | 90% | 40,596 psi | 64% | 2100 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 30,008 psi | 47% | 1867 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 40,582 psi | 64% | 1972 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 34,722 psi | 54% | 1949 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 92% | 33,924 psi | 53% | 1988 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 80% | 48,689 psi | 76% | 2024 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 42,569 psi | 67% | 1959 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 38,218 psi | 60% | 2005 fps | 95.2% |
| Bofors RP3 | <<locked>> | 86% | 30,908 psi | 48% | 1900 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 36,767 psi | 58% | 1903 fps | 98% |
| Hodgdon BL-C2 | <<locked>> | 80% | 31,865 psi | 50% | 1909 fps | 96.9% |
| Hodgdon CFE223 | 55.5 gr | 80% | 35,346 psi | 55% | 1998 fps | 95% |
| Hodgdon H322 | <<locked>> | 80% | 38,986 psi | 61% | 1985 fps | 99.9% |
| Hodgdon H335 | <<locked>> | 80% | 39,479 psi | 62% | 2005 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 94% | 42,148 psi | 66% | 2064 fps | 95.6% |
| Hodgdon H4198 | <<locked>> | 80% | 48,602 psi | 76% | 2024 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 32,706 psi | 51% | 1896 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 31,038 psi | 49% | 1903 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,193 psi | 39% | 1122 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 31,705 psi | 50% | 1860 fps | 95% |
| IMR 3031 | <<locked>> | 80% | 31,270 psi | 49% | 1906 fps | 99.6% |
| IMR 4064 | <<locked>> | 86% | 35,041 psi | 55% | 1913 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 96% | 52,170 psi | 82% | 2126 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 41,727 psi | 65% | 1946 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 33,257 psi | 52% | 1932 fps | 95.3% |
| IMR 8208 XBR | <<locked>> | 80% | 34,505 psi | 54% | 1903 fps | 96.9% |
| Lovex D073.4 | <<locked>> | 80% | 46,369 psi | 73% | 2080 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 37,855 psi | 59% | 1965 fps | 98.6% |
| Lovex D073.6 | <<locked>> | 80% | 30,095 psi | 47% | 1870 fps | 97.5% |
| Lovex S053 | <<locked>> | 80% | 53,563 psi | 84% | 1991 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 33,939 psi | 53% | 1850 fps | 95.2% |
| Lovex S062 | <<locked>> | 82% | 30,530 psi | 48% | 1844 fps | 95.7% |
| Norma 200 | <<locked>> | 80% | 45,803 psi | 72% | 2018 fps | 100% |
| Norma 201 | <<locked>> | 80% | 32,010 psi | 50% | 1857 fps | 96.2% |
| Norma 202 | <<locked>> | 80% | 31,792 psi | 50% | 1873 fps | 98.5% |
| Norma 203B | <<locked>> | 86% | 34,011 psi | 53% | 1942 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 88% | 35,998 psi | 56% | 1988 fps | 95.5% |
| Ramshot TAC | <<locked>> | 88% | 44,440 psi | 70% | 2057 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 82% | 35,244 psi | 55% | 1949 fps | 95.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 37,449 psi | 59% | 1936 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,251 psi | 40% | 1148 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 38,711 psi | 61% | 1972 fps | 99% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 49,226 psi | 77% | 2133 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 35,781 psi | 56% | 2018 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 28,239 psi | 44% | 1870 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 35,578 psi | 56% | 1903 fps | 99% |
| Rottweil R 902 | <<locked>> | 80% | 30,472 psi | 48% | 1821 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 88% | 30,980 psi | 49% | 1896 fps | 95.2% |
| Shooters World AR Plus | <<locked>> | 80% | 46,369 psi | 73% | 2080 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 30,095 psi | 47% | 1870 fps | 97.5% |
| Shooters World Precision | <<locked>> | 82% | 30,530 psi | 48% | 1844 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 40,915 psi | 64% | 1978 fps | 98.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 48,994 psi | 77% | 1821 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 43,091 psi | 68% | 2047 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 35,027 psi | 55% | 1975 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 41,162 psi | 65% | 1978 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 41,930 psi | 66% | 2034 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 33,286 psi | 52% | 1903 fps | 95% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,837 psi | 53% | 1837 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 27,427 psi | 43% | 1739 fps | 98.1% |
| Somchem S321 | <<locked>> | 80% | 36,463 psi | 57% | 1959 fps | 97.8% |
| Somchem S335 | <<locked>> | 80% | 33,286 psi | 52% | 1847 fps | 99.3% |
| Somchem S341 | <<locked>> | 82% | 33,924 psi | 53% | 1909 fps | 95% |
| Somchem S355 | <<locked>> | 88% | 32,460 psi | 51% | 1906 fps | 95.5% |
| Somchem S365 | <<locked>> | 96% | 29,733 psi | 47% | 1913 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 47,819 psi | 75% | 1972 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 38,508 psi | 60% | 1903 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 33,750 psi | 53% | 1844 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 80% | 28,805 psi | 45% | 1821 fps | 99.7% |
| Vihtavuori N140 | <<locked>> | 80% | 29,907 psi | 47% | 1824 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 86% | 28,993 psi | 45% | 1821 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 34,272 psi | 54% | 1896 fps | 96.9% |
| Vihtavuori N540 | <<locked>> | 80% | 28,703 psi | 45% | 1814 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 34,374 psi | 54% | 1916 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 32,866 psi | 52% | 1926 fps | 97.4% |
| Winchester StaBALL Match | <<locked>> | 82% | 32,213 psi | 50% | 1903 fps | 95.4% |
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 | Speer AGS SP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,326 fps; across all powders the maximum-charge window runs from 1,257 fps to 2,326 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 53–90 %, leaving at least 10 % headroom. The 400.0 gr projectile in 0.416" calls for a 1:21.0 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 | Speer AGS SP 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.