Load Specifications
Load data in caliber .458 Lott with .458 | 465gr | A-Square MONO RN bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 52 and Hodgdon CFE223.
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>> | 92% | 53,882 psi | 86% | 2211 fps | 100% |
| Accurate 2200 | <<locked>> | 84% | 54,737 psi | 88% | 2287 fps | 98.9% |
| Accurate 2230 | <<locked>> | 84% | 55,245 psi | 89% | 2297 fps | 99.2% |
| Accurate 2460 | <<locked>> | 90% | 55,724 psi | 89% | 2270 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 53,200 psi | 85% | 2257 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 53,287 psi | 85% | 2280 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 52,794 psi | 85% | 2287 fps | 100% |
| Accurate LT-30 | <<locked>> | 86% | 54,882 psi | 88% | 2169 fps | 100% |
| Accurate LT-32 | <<locked>> | 86% | 55,347 psi | 89% | 2188 fps | 100% |
| ADI AR 2206H | <<locked>> | 96% | 55,883 psi | 90% | 2320 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 84% | 56,188 psi | 90% | 2182 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 53,432 psi | 86% | 2274 fps | 98.8% |
| ADI AR 2219 | <<locked>> | 86% | 54,520 psi | 87% | 2267 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 94% | 55,521 psi | 89% | 2287 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 94% | 54,389 psi | 87% | 2267 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 53,563 psi | 86% | 2329 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 98% | 55,419 psi | 89% | 2408 fps | 99% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 52,011 psi | 83% | 2290 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 88% | 54,128 psi | 87% | 2218 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 53,142 psi | 85% | 2306 fps | 99% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 46,006 psi | 74% | 2287 fps | 98.7% |
| Alliant Reloder-7 | <<locked>> | 82% | 53,737 psi | 86% | 2162 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 53,519 psi | 86% | 2172 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 96% | 55,579 psi | 89% | 2336 fps | 98.8% |
| Bofors RP3ᴾ | <<locked>> | 100% | 51,953 psi | 83% | 2300 fps | 99.7% |
| Hodgdon Benchmark | <<locked>> | 92% | 54,926 psi | 88% | 2238 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 94% | 53,708 psi | 86% | 2313 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 92% | 55,608 psi | 89% | 2388 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 88% | 53,084 psi | 85% | 2251 fps | 100% |
| Hodgdon H335 | <<locked>> | 88% | 53,896 psi | 86% | 2274 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 54,056 psi | 87% | 2310 fps | 98.1% |
| Hodgdon H4198 | <<locked>> | 82% | 53,548 psi | 86% | 2169 fps | 100% |
| Hodgdon H4895 | <<locked>> | 96% | 56,376 psi | 90% | 2329 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 36,622 psi | 59% | 2070 fps | 96.4% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 54,462 psi | 87% | 2352 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,069 psi | 55% | 1319 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 54,505 psi | 87% | 2290 fps | 99.6% |
| IMR 3031 | <<locked>> | 96% | 55,042 psi | 88% | 2316 fps | 100% |
| IMR 4064ᴾ | <<locked>> | 100% | 56,304 psi | 90% | 2297 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 96% | 54,389 psi | 87% | 2241 fps | 95.7% |
| IMR 4198 | <<locked>> | 88% | 54,853 psi | 88% | 2182 fps | 100% |
| IMR 4895 | <<locked>> | 98% | 54,360 psi | 87% | 2333 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 94% | 55,521 psi | 89% | 2287 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 84% | 56,130 psi | 90% | 2280 fps | 100% |
| Lovex D073.5 | <<locked>> | 90% | 55,825 psi | 90% | 2280 fps | 100% |
| Lovex D073.6 | <<locked>> | 96% | 54,491 psi | 87% | 2303 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 53,606 psi | 86% | 2224 fps | 99.3% |
| Lovex S062ᴾ | <<locked>> | 100% | 55,288 psi | 89% | 2297 fps | 99.9% |
| Norma 200 | <<locked>> | 84% | 54,041 psi | 87% | 2195 fps | 100% |
| Norma 201 | <<locked>> | 96% | 54,781 psi | 88% | 2277 fps | 99.9% |
| Norma 202 | <<locked>> | 96% | 54,897 psi | 88% | 2283 fps | 100% |
| Norma 203Bᴾ | <<locked>> | 100% | 55,535 psi | 89% | 2339 fps | 99.5% |
| Ramshot Big Gameᴾ | <<locked>> | 100% | 56,101 psi | 90% | 2362 fps | 99.4% |
| Ramshot TAC | <<locked>> | 94% | 56,333 psi | 90% | 2300 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 94% | 55,042 psi | 88% | 2316 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 90% | 53,911 psi | 86% | 2254 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,360 psi | 55% | 1355 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 90% | 55,521 psi | 89% | 2277 fps | 100% |
| ReloadSwiss RS 50ᴾ | <<locked>> | 100% | 55,143 psi | 88% | 2293 fps | 96.6% |
| ReloadSwiss RS 52 | <<locked>> | 98% | 56,173 psi | 90% | 2402 fps | 99.3% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 49,197 psi | 79% | 2343 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 55,970 psi | 90% | 2264 fps | 100% |
| Rottweil R 902 | <<locked>> | 98% | 54,810 psi | 88% | 2270 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 48,370 psi | 78% | 2247 fps | 99.2% |
| Shooters World AR Plus | <<locked>> | 84% | 56,130 psi | 90% | 2280 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 96% | 54,491 psi | 87% | 2303 fps | 100% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 55,288 psi | 89% | 2297 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 88% | 55,941 psi | 90% | 2254 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 55,898 psi | 90% | 1965 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 54,795 psi | 88% | 2277 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 50,401 psi | 81% | 2300 fps | 98.9% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 54,998 psi | 88% | 2231 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 94% | 54,012 psi | 87% | 2277 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 96% | 54,360 psi | 87% | 2300 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 54,143 psi | 87% | 2198 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 53,069 psi | 85% | 2192 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 53,229 psi | 85% | 2280 fps | 99.9% |
| Somchem S335 | <<locked>> | 96% | 56,130 psi | 90% | 2234 fps | 100% |
| Somchem S341 | <<locked>> | 94% | 53,345 psi | 86% | 2274 fps | 99.2% |
| Somchem S355ᴾ | <<locked>> | 100% | 49,545 psi | 79% | 2251 fps | 99.2% |
| Somchem S365ᴾ | <<locked>> | 100% | 35,404 psi | 57% | 2110 fps | 97.6% |
| Vihtavuori N120 | <<locked>> | 84% | 56,086 psi | 90% | 2139 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 54,070 psi | 87% | 2175 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 53,809 psi | 86% | 2185 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 53,417 psi | 86% | 2247 fps | 100% |
| Vihtavuori N140 | <<locked>> | 98% | 55,274 psi | 89% | 2264 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 47,688 psi | 76% | 2198 fps | 99.7% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 42,192 psi | 68% | 2156 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 94% | 56,289 psi | 90% | 2287 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 98% | 53,374 psi | 86% | 2264 fps | 100% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 43,569 psi | 70% | 2152 fps | 98.1% |
| Winchester 748 | <<locked>> | 94% | 54,708 psi | 88% | 2326 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 96% | 53,592 psi | 86% | 2306 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 2015 | <<locked>> | 80% | 37,304 psi | 60% | 1995 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 47,935 psi | 77% | 2195 fps | 98% |
| Accurate 2230 | <<locked>> | 80% | 48,109 psi | 77% | 2205 fps | 98.3% |
| Accurate 2460 | <<locked>> | 80% | 40,089 psi | 64% | 2070 fps | 99.6% |
| Accurate 2495 | <<locked>> | 80% | 29,617 psi | 47% | 1916 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 35,447 psi | 57% | 2028 fps | 98.8% |
| Accurate 4064 | <<locked>> | 80% | 28,050 psi | 45% | 1900 fps | 97.9% |
| Accurate LT-30 | <<locked>> | 80% | 45,803 psi | 73% | 2060 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 46,166 psi | 74% | 2073 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 34,142 psi | 55% | 1988 fps | 95.4% |
| ADI AR 2207 | <<locked>> | 80% | 49,734 psi | 80% | 2113 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 37,304 psi | 60% | 2034 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 44,701 psi | 72% | 2146 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 36,071 psi | 58% | 2005 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 80% | 34,389 psi | 55% | 2011 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 41,249 psi | 66% | 2152 fps | 98.2% |
| Alliant Power Pro 2000-MR | 79.1 gr | 88% | 39,856 psi | 64% | 2169 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 31,531 psi | 51% | 1965 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 42,482 psi | 68% | 2073 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 36,608 psi | 59% | 2057 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 90% | 33,504 psi | 54% | 2057 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 80% | 50,676 psi | 81% | 2126 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 44,251 psi | 71% | 2060 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 37,565 psi | 60% | 2070 fps | 95.1% |
| Bofors RP3 | <<locked>> | 84% | 30,748 psi | 49% | 1965 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 38,377 psi | 62% | 2005 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 33,591 psi | 54% | 2011 fps | 97.4% |
| Hodgdon CFE223 | 73.6 gr | 80% | 37,086 psi | 59% | 2106 fps | 95.7% |
| Hodgdon H322 | <<locked>> | 80% | 40,872 psi | 66% | 2093 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 41,336 psi | 66% | 2110 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 92% | 41,669 psi | 67% | 2136 fps | 95.6% |
| Hodgdon H4198 | <<locked>> | 80% | 50,430 psi | 81% | 2129 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 34,287 psi | 55% | 1998 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 34,563 psi | 55% | 2031 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 30,501 psi | 49% | 1962 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,251 psi | 40% | 1178 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 33,199 psi | 53% | 1962 fps | 95.6% |
| IMR 3031 | <<locked>> | 80% | 32,822 psi | 53% | 2005 fps | 99.8% |
| IMR 4064 | <<locked>> | 86% | 36,695 psi | 59% | 2018 fps | 95.7% |
| IMR 4166 Enduron | <<locked>> | 94% | 51,155 psi | 82% | 2201 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 43,453 psi | 70% | 2047 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 32,909 psi | 53% | 1998 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 36,071 psi | 58% | 2005 fps | 97.4% |
| Lovex D073.4 | <<locked>> | 80% | 48,892 psi | 78% | 2195 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 39,769 psi | 64% | 2070 fps | 99% |
| Lovex D073.6 | <<locked>> | 80% | 31,981 psi | 51% | 1975 fps | 98% |
| Lovex S060 | <<locked>> | 80% | 35,404 psi | 57% | 1952 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 30,095 psi | 48% | 1903 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 47,805 psi | 77% | 2123 fps | 100% |
| Norma 201 | <<locked>> | 80% | 33,475 psi | 54% | 1955 fps | 96.7% |
| Norma 202 | <<locked>> | 80% | 33,344 psi | 53% | 1972 fps | 98.8% |
| Norma 203B | <<locked>> | 84% | 33,678 psi | 54% | 2008 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 86% | 35,534 psi | 57% | 2054 fps | 95.5% |
| Ramshot TAC | <<locked>> | 86% | 43,656 psi | 70% | 2126 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 34,679 psi | 56% | 2011 fps | 95.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 39,204 psi | 63% | 2041 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,469 psi | 41% | 1207 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 40,466 psi | 65% | 2077 fps | 99.3% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 48,501 psi | 78% | 2208 fps | 95.3% |
| ReloadSwiss RS 52 | 73.2 gr | 84% | 35,302 psi | 57% | 2087 fps | 95.1% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 27,775 psi | 45% | 1929 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 37,072 psi | 59% | 2001 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 31,937 psi | 51% | 1919 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 86% | 30,763 psi | 49% | 1959 fps | 95.1% |
| Shooters World AR Plus | <<locked>> | 80% | 48,892 psi | 78% | 2195 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,981 psi | 51% | 1975 fps | 98% |
| Shooters World Precision | <<locked>> | 80% | 30,095 psi | 48% | 1903 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 42,772 psi | 69% | 2083 fps | 98.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 50,401 psi | 81% | 1909 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 45,063 psi | 72% | 2156 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 34,650 psi | 56% | 2044 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 43,033 psi | 69% | 2083 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 41,249 psi | 66% | 2100 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 34,940 psi | 56% | 2008 fps | 95.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,317 psi | 57% | 1936 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,703 psi | 46% | 1831 fps | 98.5% |
| Somchem S321 | <<locked>> | 80% | 38,189 psi | 61% | 2064 fps | 98.2% |
| Somchem S335 | <<locked>> | 80% | 34,708 psi | 56% | 1942 fps | 99.5% |
| Somchem S341 | <<locked>> | 82% | 35,737 psi | 57% | 2014 fps | 95.8% |
| Somchem S355 | <<locked>> | 86% | 32,126 psi | 52% | 1969 fps | 95.3% |
| Somchem S365 | <<locked>> | 94% | 29,530 psi | 47% | 1982 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 49,705 psi | 80% | 2070 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 40,161 psi | 64% | 2001 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 35,288 psi | 57% | 1942 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 30,400 psi | 49% | 1919 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 31,502 psi | 51% | 1923 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 84% | 28,631 psi | 46% | 1880 fps | 95.5% |
| Vihtavuori N160 | <<locked>> | 98% | 39,639 psi | 64% | 2116 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 35,766 psi | 57% | 1998 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 80% | 30,182 psi | 48% | 1913 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 33,692 psi | 54% | 1978 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 34,534 psi | 55% | 2031 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 31,734 psi | 51% | 1962 fps | 95.2% |
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 117 powders for .458 Lott loaded with the .458 | 465gr | A-Square MONO RN. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,408 fps; across all powders the maximum-charge window runs from 1,319 fps to 2,408 fps. Accurate 4064 gives the best case fill at 100 %, and 117 of the 117 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 46–90 %, leaving at least 10 % headroom. Accurate 4064, Accurate 4350, 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. Alliant Power Pro 2000-MR, ReloadSwiss RS 52, Hodgdon CFE223 rank at the top here: for .458 Lott with the .458 | 465gr | A-Square MONO RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Alliant Reloder-23, Bofors RP7 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.