Load Specifications
Load data in caliber .416 Taylor Mag. with .416 | 400gr | North Fork Semi Spitz 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% | 54,984 psi | 86% | 2073 fps | 100% |
| Accurate 2015 | <<locked>> | 94% | 54,462 psi | 85% | 2133 fps | 100% |
| Accurate 2200 | <<locked>> | 86% | 55,651 psi | 87% | 2208 fps | 98.9% |
| Accurate 2230 | <<locked>> | 86% | 56,405 psi | 88% | 2221 fps | 99.2% |
| Accurate 2460 | <<locked>> | 92% | 56,492 psi | 89% | 2192 fps | 100% |
| Accurate 2495ᴾ | <<locked>> | 100% | 53,417 psi | 84% | 2175 fps | 100% |
| Accurate 2520 | <<locked>> | 96% | 57,421 psi | 90% | 2238 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 49,530 psi | 78% | 2169 fps | 100% |
| Accurate LT-30 | <<locked>> | 88% | 55,999 psi | 88% | 2093 fps | 100% |
| Accurate LT-32 | <<locked>> | 88% | 56,507 psi | 89% | 2113 fps | 100% |
| ADI AR 2206H | <<locked>> | 98% | 56,623 psi | 89% | 2238 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 86% | 57,000 psi | 89% | 2106 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 2152 fps | 98.4% |
| ADI AR 2219 | <<locked>> | 88% | 55,564 psi | 87% | 2192 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 96% | 56,159 psi | 88% | 2205 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 96% | 54,592 psi | 86% | 2188 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 92% | 57,696 psi | 90% | 2290 fps | 99.9% |
| Alliant Power Pro 2000-MRᴾ | <<locked>> | 100% | 56,246 psi | 88% | 2323 fps | 99% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 49,081 psi | 77% | 2169 fps | 99.4% |
| Alliant Reloder-10x | <<locked>> | 90% | 54,766 psi | 86% | 2139 fps | 100% |
| Alliant Reloder-15ᴾ | <<locked>> | 100% | 53,679 psi | 84% | 2224 fps | 99% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 43,671 psi | 68% | 2162 fps | 98.2% |
| Alliant Reloder-7 | <<locked>> | 84% | 54,926 psi | 86% | 2090 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 88% | 54,592 psi | 86% | 2100 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 98% | 56,144 psi | 88% | 2251 fps | 98.8% |
| Bofors RP3ᴾ | <<locked>> | 100% | 48,994 psi | 77% | 2178 fps | 99.4% |
| Hodgdon Benchmark | <<locked>> | 94% | 55,535 psi | 87% | 2159 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 96% | 54,259 psi | 85% | 2234 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 94% | 56,260 psi | 88% | 2303 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 92% | 57,305 psi | 90% | 2208 fps | 100% |
| Hodgdon H335 | <<locked>> | 90% | 54,723 psi | 86% | 2198 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 50,966 psi | 80% | 2182 fps | 97.5% |
| Hodgdon H4198 | <<locked>> | 84% | 54,679 psi | 86% | 2093 fps | 100% |
| Hodgdon H4895 | <<locked>> | 98% | 57,000 psi | 89% | 2247 fps | 99.8% |
| Hodgdon LEVERevolutionᴾ | <<locked>> | 100% | 54,926 psi | 86% | 2270 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,910 psi | 53% | 1257 fps | 100% |
| Hodgdon VARGET | <<locked>> | 98% | 55,303 psi | 87% | 2211 fps | 99.6% |
| IMR 3031 | <<locked>> | 98% | 55,376 psi | 87% | 2234 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 53,534 psi | 84% | 2178 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 98% | 55,288 psi | 87% | 2162 fps | 95.7% |
| IMR 4198 | <<locked>> | 90% | 55,608 psi | 87% | 2106 fps | 100% |
| IMR 4895ᴾ | <<locked>> | 100% | 54,897 psi | 86% | 2251 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 96% | 56,159 psi | 88% | 2205 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 86% | 57,043 psi | 89% | 2201 fps | 100% |
| Lovex D073.5 | <<locked>> | 92% | 56,420 psi | 88% | 2201 fps | 100% |
| Lovex D073.6 | <<locked>> | 98% | 54,853 psi | 86% | 2221 fps | 100% |
| Lovex S053 | <<locked>> | 82% | 56,782 psi | 89% | 2021 fps | 100% |
| Lovex S060 | <<locked>> | 98% | 57,595 psi | 90% | 2182 fps | 99.5% |
| Lovex S062ᴾ | <<locked>> | 100% | 52,315 psi | 82% | 2175 fps | 99.8% |
| Norma 200 | <<locked>> | 86% | 54,940 psi | 86% | 2119 fps | 100% |
| Norma 201 | <<locked>> | 98% | 55,114 psi | 86% | 2195 fps | 99.9% |
| Norma 202 | <<locked>> | 98% | 55,405 psi | 87% | 2201 fps | 100% |
| Norma 203Bᴾ | <<locked>> | 100% | 52,649 psi | 83% | 2218 fps | 99.2% |
| Ramshot Big Gameᴾ | <<locked>> | 100% | 53,026 psi | 83% | 2234 fps | 99.1% |
| Ramshot TAC | <<locked>> | 96% | 57,319 psi | 90% | 2221 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 96% | 55,695 psi | 87% | 2238 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 92% | 54,679 psi | 86% | 2172 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,040 psi | 53% | 1286 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 92% | 56,391 psi | 88% | 2198 fps | 100% |
| ReloadSwiss RS 50ᴾ | <<locked>> | 100% | 52,185 psi | 82% | 2169 fps | 95.9% |
| ReloadSwiss RS 52ᴾ | <<locked>> | 100% | 56,449 psi | 88% | 2316 fps | 99.3% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 46,760 psi | 73% | 2218 fps | 100% |
| Rottweil R 901 | <<locked>> | 96% | 56,449 psi | 88% | 2185 fps | 100% |
| Rottweil R 902ᴾ | <<locked>> | 100% | 55,405 psi | 87% | 2188 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 45,484 psi | 71% | 2129 fps | 98.8% |
| Shooters World AR Plus | <<locked>> | 86% | 57,043 psi | 89% | 2201 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 98% | 54,853 psi | 86% | 2221 fps | 100% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 52,315 psi | 82% | 2175 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 90% | 56,956 psi | 89% | 2178 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 56,956 psi | 89% | 1896 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 88% | 55,854 psi | 88% | 2201 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 47,688 psi | 75% | 2175 fps | 98.5% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 55,825 psi | 87% | 2152 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 96% | 54,882 psi | 86% | 2198 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 98% | 54,824 psi | 86% | 2218 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 96% | 54,940 psi | 86% | 2119 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 50,415 psi | 79% | 2080 fps | 100% |
| Somchem S321 | <<locked>> | 94% | 57,740 psi | 90% | 2241 fps | 100% |
| Somchem S335 | <<locked>> | 98% | 56,550 psi | 89% | 2152 fps | 100% |
| Somchem S341 | <<locked>> | 98% | 57,595 psi | 90% | 2234 fps | 99.5% |
| Somchem S355ᴾ | <<locked>> | 100% | 46,760 psi | 73% | 2133 fps | 98.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 33,489 psi | 52% | 1991 fps | 96.8% |
| Vihtavuori N120 | <<locked>> | 86% | 56,855 psi | 89% | 2064 fps | 100% |
| Vihtavuori N130 | <<locked>> | 92% | 54,868 psi | 86% | 2096 fps | 100% |
| Vihtavuori N133 | <<locked>> | 98% | 57,740 psi | 90% | 2142 fps | 100% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 2165 fps | 100% |
| Vihtavuori N140ᴾ | <<locked>> | 100% | 55,854 psi | 88% | 2185 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 45,020 psi | 71% | 2083 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 96% | 57,116 psi | 90% | 2208 fps | 99.9% |
| Vihtavuori N540ᴾ | <<locked>> | 100% | 53,737 psi | 84% | 2185 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 41,437 psi | 65% | 2034 fps | 97.5% |
| Winchester 748 | <<locked>> | 96% | 55,347 psi | 87% | 2244 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 98% | 54,259 psi | 85% | 2224 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% | 51,663 psi | 81% | 2037 fps | 100% |
| Accurate 2015 | <<locked>> | 80% | 35,549 psi | 56% | 1893 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 45,774 psi | 72% | 2080 fps | 97.5% |
| Accurate 2230 | <<locked>> | 80% | 45,803 psi | 72% | 2090 fps | 97.8% |
| Accurate 2460 | <<locked>> | 80% | 38,029 psi | 60% | 1962 fps | 99.4% |
| Accurate 2495 | <<locked>> | 80% | 27,949 psi | 44% | 1818 fps | 99.6% |
| Accurate 2520 | <<locked>> | 80% | 33,402 psi | 52% | 1919 fps | 98.4% |
| Accurate 4064 | <<locked>> | 80% | 26,498 psi | 42% | 1801 fps | 97.4% |
| Accurate LT-30 | <<locked>> | 80% | 44,092 psi | 69% | 1955 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 44,483 psi | 70% | 1969 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 82% | 34,548 psi | 54% | 1923 fps | 95.5% |
| ADI AR 2207 | <<locked>> | 80% | 47,761 psi | 75% | 2008 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 37,637 psi | 59% | 1962 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 42,467 psi | 67% | 2037 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 34,447 psi | 54% | 1900 fps | 96.9% |
| Alliant AR-Comp | <<locked>> | 80% | 32,605 psi | 51% | 1909 fps | 100% |
| Alliant Power Pro 1200-R | 50.8 gr | 80% | 39,218 psi | 61% | 2041 fps | 97.7% |
| Alliant Power Pro 2000-MR | 60.8 gr | 90% | 40,350 psi | 63% | 2096 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 29,834 psi | 47% | 1860 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 40,524 psi | 64% | 1969 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 36,811 psi | 58% | 1985 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 92% | 33,779 psi | 53% | 1985 fps | 95% |
| Alliant Reloder-7 | <<locked>> | 80% | 48,602 psi | 76% | 2021 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 42,395 psi | 66% | 1955 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 38,029 psi | 60% | 2001 fps | 95.2% |
| Bofors RP3 | <<locked>> | 86% | 30,864 psi | 48% | 1900 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 36,753 psi | 58% | 1903 fps | 98% |
| Hodgdon BL-C2 | <<locked>> | 80% | 31,807 psi | 50% | 1906 fps | 96.8% |
| Hodgdon CFE223 | 56.7 gr | 82% | 37,623 psi | 59% | 2037 fps | 95.8% |
| Hodgdon H322 | <<locked>> | 80% | 38,914 psi | 61% | 1985 fps | 99.9% |
| Hodgdon H335 | <<locked>> | 80% | 39,218 psi | 61% | 1998 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 94% | 42,177 psi | 66% | 2064 fps | 95.6% |
| Hodgdon H4198 | <<locked>> | 80% | 48,588 psi | 76% | 2024 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 32,677 psi | 51% | 1896 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 30,995 psi | 49% | 1900 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,077 psi | 39% | 1119 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 31,676 psi | 50% | 1860 fps | 95% |
| IMR 3031 | <<locked>> | 80% | 31,198 psi | 49% | 1903 fps | 99.6% |
| IMR 4064 | <<locked>> | 86% | 35,056 psi | 55% | 1913 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 96% | 51,924 psi | 81% | 2123 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 41,669 psi | 65% | 1942 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 33,199 psi | 52% | 1932 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 34,447 psi | 54% | 1900 fps | 96.9% |
| Lovex D073.4 | <<locked>> | 80% | 46,354 psi | 73% | 2080 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 37,811 psi | 59% | 1962 fps | 98.6% |
| Lovex D073.6 | <<locked>> | 80% | 30,066 psi | 47% | 1867 fps | 97.5% |
| Lovex S053 | <<locked>> | 80% | 53,519 psi | 84% | 1988 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 33,910 psi | 53% | 1850 fps | 95.2% |
| Lovex S062 | <<locked>> | 82% | 30,327 psi | 48% | 1841 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 45,788 psi | 72% | 2018 fps | 100% |
| Norma 201 | <<locked>> | 80% | 31,966 psi | 50% | 1857 fps | 96.2% |
| Norma 202 | <<locked>> | 80% | 31,589 psi | 50% | 1867 fps | 98.4% |
| Norma 203B | <<locked>> | 86% | 33,968 psi | 53% | 1939 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 88% | 35,969 psi | 56% | 1985 fps | 95.5% |
| Ramshot TAC | <<locked>> | 88% | 44,251 psi | 69% | 2054 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 82% | 35,201 psi | 55% | 1949 fps | 95.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 37,405 psi | 59% | 1936 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,135 psi | 39% | 1145 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 38,682 psi | 61% | 1969 fps | 99% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 49,052 psi | 77% | 2129 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 35,766 psi | 56% | 2018 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 28,108 psi | 44% | 1864 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 35,346 psi | 55% | 1900 fps | 99% |
| Rottweil R 902 | <<locked>> | 80% | 30,472 psi | 48% | 1821 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 88% | 30,806 psi | 48% | 1890 fps | 95.1% |
| Shooters World AR Plus | <<locked>> | 80% | 46,354 psi | 73% | 2080 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 30,066 psi | 47% | 1867 fps | 97.5% |
| Shooters World Precision | <<locked>> | 82% | 30,327 psi | 48% | 1841 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 40,886 psi | 64% | 1975 fps | 98% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 48,921 psi | 77% | 1818 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 42,888 psi | 67% | 2044 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 35,027 psi | 55% | 1975 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 41,104 psi | 64% | 1978 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 41,684 psi | 65% | 2028 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 35,230 psi | 55% | 1939 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 33,794 psi | 53% | 1837 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 27,412 psi | 43% | 1736 fps | 98.1% |
| Somchem S321 | <<locked>> | 80% | 36,274 psi | 57% | 1955 fps | 97.7% |
| Somchem S335 | <<locked>> | 80% | 33,214 psi | 52% | 1844 fps | 99.2% |
| Somchem S341 | <<locked>> | 82% | 33,895 psi | 53% | 1906 fps | 95% |
| Somchem S355 | <<locked>> | 88% | 32,271 psi | 51% | 1900 fps | 95.4% |
| Somchem S365 | <<locked>> | 96% | 29,718 psi | 47% | 1913 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 47,790 psi | 75% | 1972 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 38,493 psi | 60% | 1900 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 33,707 psi | 53% | 1844 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 80% | 28,718 psi | 45% | 1821 fps | 99.6% |
| Vihtavuori N140 | <<locked>> | 80% | 29,892 psi | 47% | 1821 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 86% | 28,950 psi | 45% | 1821 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 34,040 psi | 53% | 1893 fps | 96.9% |
| Vihtavuori N540 | <<locked>> | 80% | 28,660 psi | 45% | 1814 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 34,214 psi | 54% | 1913 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 32,634 psi | 51% | 1919 fps | 97.3% |
| Winchester StaBALL Match | <<locked>> | 82% | 32,213 psi | 50% | 1900 fps | 95.3% |
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 115 powders for .416 Taylor Mag. loaded with the .416 | 400gr | North Fork Semi Spitz. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,323 fps; across all powders the maximum-charge window runs from 1,257 fps to 2,323 fps. Accurate 2495 gives the best case fill at 100 %, and 115 of the 115 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 400.0 gr projectile in 0.416" calls for a 1:20.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 2700, Accurate 4064 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 | North Fork Semi Spitz they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 4350, Alliant Reloder-16 burn incompletely and react more sensitively to barrel length and temperature. 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.