Load Specifications
Load data in caliber .450 Rigby with .458 | 500gr | Hornady DGX bullet and 94 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 60 and Hodgdon Superformance.
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 2015 | <<locked>> | 84% | 52,286 psi | 90% | 2175 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 50,140 psi | 86% | 2195 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 52,011 psi | 90% | 2251 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,821 psi | 86% | 2195 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 50,067 psi | 86% | 2234 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,359 psi | 90% | 2343 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 86% | 51,140 psi | 88% | 2260 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 52,011 psi | 90% | 2260 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 50,343 psi | 87% | 2221 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 50,734 psi | 87% | 2198 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 50,038 psi | 86% | 2352 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 51,648 psi | 89% | 2277 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 52,315 psi | 90% | 2297 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,908 psi | 88% | 2346 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 51,735 psi | 89% | 2379 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,143 psi | 62% | 2136 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,697 psi | 68% | 2257 fps | 97.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 50,444 psi | 87% | 2274 fps | 99.6% |
| Bofors RP3 | <<locked>> | 92% | 51,880 psi | 89% | 2290 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 52,373 psi | 90% | 2264 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 52,199 psi | 90% | 2205 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 52,431 psi | 90% | 2287 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 50,705 psi | 87% | 2323 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 49,690 psi | 86% | 2257 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 98% | 51,909 psi | 89% | 2343 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 94% | 49,966 psi | 86% | 2267 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 86% | 51,590 psi | 89% | 2267 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,992 psi | 81% | 2244 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 50,343 psi | 87% | 2293 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 49,153 psi | 85% | 2323 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,302 psi | 61% | 1352 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 49,588 psi | 85% | 2228 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 51,271 psi | 88% | 2251 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 51,648 psi | 89% | 2247 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 51,851 psi | 89% | 2231 fps | 97.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,214 psi | 90% | 2287 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 51,285 psi | 88% | 2251 fps | 97.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,617 psi | 86% | 2293 fps | 99.5% |
| IMR 4895 | <<locked>> | 88% | 50,343 psi | 87% | 2277 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 50,343 psi | 87% | 2221 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 50,328 psi | 87% | 2241 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 51,184 psi | 88% | 2201 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 51,155 psi | 88% | 2241 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 50,328 psi | 87% | 2244 fps | 98.7% |
| Lovex S070 | <<locked>> | 98% | 50,807 psi | 88% | 2270 fps | 97.9% |
| Norma 201 | <<locked>> | 86% | 49,980 psi | 86% | 2215 fps | 100% |
| Norma 202 | <<locked>> | 86% | 50,401 psi | 87% | 2218 fps | 100% |
| Norma 203B | <<locked>> | 90% | 51,488 psi | 89% | 2283 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 51,663 psi | 89% | 2333 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 51,517 psi | 89% | 2306 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,488 psi | 87% | 2329 fps | 98.5% |
| Ramshot TAC | <<locked>> | 84% | 50,430 psi | 87% | 2238 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 84% | 49,690 psi | 86% | 2247 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 51,039 psi | 88% | 2221 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,824 psi | 62% | 1388 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 50,198 psi | 87% | 2244 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 52,417 psi | 90% | 2349 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 51,663 psi | 89% | 2379 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,677 psi | 89% | 2362 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,112 psi | 90% | 2385 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 84% | 51,256 psi | 88% | 2198 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 50,430 psi | 87% | 2215 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 51,779 psi | 89% | 2283 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 52,373 psi | 90% | 2264 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 50,328 psi | 87% | 2244 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 50,328 psi | 87% | 2241 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 51,155 psi | 88% | 2241 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 50,807 psi | 88% | 2270 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 50,038 psi | 86% | 2293 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 51,851 psi | 89% | 2257 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 49,487 psi | 85% | 2238 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 51,735 psi | 89% | 2165 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 51,547 psi | 89% | 2165 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 50,459 psi | 87% | 2205 fps | 97.5% |
| Somchem S321 | <<locked>> | 82% | 51,053 psi | 88% | 2247 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 51,024 psi | 88% | 2165 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 51,474 psi | 89% | 2254 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 52,214 psi | 90% | 2280 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,093 psi | 79% | 2293 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 51,793 psi | 89% | 2136 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 51,924 psi | 90% | 2152 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 49,951 psi | 86% | 2185 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 50,734 psi | 87% | 2198 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 50,343 psi | 87% | 2224 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 50,937 psi | 88% | 2287 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 84% | 50,618 psi | 87% | 2218 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 52,054 psi | 90% | 2238 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 49,864 psi | 86% | 2293 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,856 psi | 67% | 2195 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 51,256 psi | 88% | 2274 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 50,053 psi | 86% | 2257 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 52,112 psi | 90% | 2343 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,198 psi | 56% | 2133 fps | 98.3% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,388 psi | 90% | 2287 fps | 100% |
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% | 46,137 psi | 80% | 2100 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,798 psi | 67% | 2047 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,484 psi | 78% | 2169 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 43,758 psi | 75% | 2106 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 36,695 psi | 63% | 2044 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 30,298 psi | 52% | 1985 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 42,424 psi | 73% | 2133 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 36,172 psi | 62% | 2014 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,469 psi | 77% | 2139 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 44,396 psi | 77% | 2123 fps | 100% |
| Alliant Power Pro 2000-MR | 85 gr | 80% | 38,276 psi | 66% | 2159 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,592 psi | 61% | 2034 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,218 psi | 66% | 2083 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 31,386 psi | 54% | 1998 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,589 psi | 53% | 2008 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,529 psi | 49% | 1965 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 34,766 psi | 60% | 2156 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,394 psi | 71% | 2139 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 35,041 psi | 60% | 2037 fps | 98.9% |
| Bofors RP7 | <<locked>> | 90% | 43,584 psi | 75% | 2139 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,369 psi | 80% | 2129 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,888 psi | 74% | 2159 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,181 psi | 81% | 2274 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 80% | 35,911 psi | 62% | 2037 fps | 96.5% |
| Hodgdon H414 | <<locked>> | 90% | 40,074 psi | 69% | 2162 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 92% | 46,963 psi | 81% | 2224 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 42,772 psi | 74% | 2142 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 26,934 psi | 46% | 1877 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,653 psi | 67% | 2123 fps | 99.5% |
| Hodgdon Superformance | 101.8 gr | 92% | 42,815 psi | 74% | 2224 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,324 psi | 45% | 1207 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,176 psi | 71% | 2106 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 42,250 psi | 73% | 2133 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,971 psi | 65% | 2041 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,437 psi | 70% | 2057 fps | 95.2% |
| IMR 4350 | <<locked>> | 94% | 43,511 psi | 75% | 2162 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 40,277 psi | 69% | 2083 fps | 95.1% |
| IMR 4831 | <<locked>> | 86% | 31,618 psi | 55% | 1998 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 39,102 psi | 67% | 2106 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 44,469 psi | 77% | 2139 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 41,191 psi | 71% | 2116 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,685 psi | 74% | 2080 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 37,753 psi | 65% | 2044 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 35,056 psi | 60% | 2001 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 39,784 psi | 69% | 2106 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 41,669 psi | 72% | 2096 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 41,814 psi | 72% | 2100 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,579 psi | 65% | 2073 fps | 98.6% |
| Norma URP | <<locked>> | 84% | 31,140 psi | 54% | 1991 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 36,927 psi | 64% | 2087 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 36,811 psi | 63% | 2110 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 44,295 psi | 76% | 2146 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,642 psi | 75% | 2162 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,935 psi | 83% | 2178 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 46% | 1237 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 38,870 psi | 67% | 2070 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,784 psi | 69% | 2165 fps | 98.7% |
| ReloadSwiss RS 60 | 83.7 gr | 80% | 32,547 psi | 56% | 2060 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,387 psi | 56% | 2047 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 35,027 psi | 60% | 2096 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 45,571 psi | 79% | 2123 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,711 psi | 68% | 2057 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 32,953 psi | 57% | 1991 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 43,584 psi | 75% | 2139 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 35,056 psi | 60% | 2001 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,191 psi | 71% | 2116 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,753 psi | 65% | 2044 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 39,784 psi | 69% | 2106 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,881 psi | 58% | 2031 fps | 97.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,395 psi | 73% | 2123 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,886 psi | 70% | 2110 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,192 psi | 74% | 2054 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,766 psi | 62% | 1952 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 41,495 psi | 72% | 2080 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 47,848 psi | 82% | 2205 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,670 psi | 74% | 2057 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,163 psi | 73% | 2123 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 33,982 psi | 59% | 1998 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 24,598 psi | 42% | 1864 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 48,776 psi | 84% | 2100 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,439 psi | 75% | 2047 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,001 psi | 67% | 2041 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,523 psi | 68% | 2051 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,155 psi | 55% | 1946 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 84% | 32,532 psi | 56% | 1991 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 44,541 psi | 77% | 2136 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 37,956 psi | 65% | 2044 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 31,836 psi | 55% | 1995 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 90% | 28,384 psi | 49% | 1982 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,660 psi | 49% | 1890 fps | 96.2% |
| Winchester 748 | <<locked>> | 80% | 43,772 psi | 75% | 2172 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 40,219 psi | 69% | 2162 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,442 psi | 49% | 2028 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,248 psi | 69% | 2116 fps | 99.4% |
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 94 powders for .450 Rigby loaded with the .458 | 500gr | Hornady DGX. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,385 fps; across all powders the maximum-charge window runs from 1,352 fps to 2,385 fps. Accurate 4350 gives the best case fill at 100 %, and 94 of the 94 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (400 MPa), the top charges use 56–90 %, 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 4350, Alliant Reloder-16, Alliant Reloder-23 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 60, Hodgdon Superformance rank at the top here: for .450 Rigby with the .458 | 500gr | Hornady DGX they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.