Load Specifications
Load data in caliber .500 Jeffery Riml. with .510 | 550gr | Impala RNFP KO bullet and 42 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, Somchem S365 and Alliant Reloder-17.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 82% | 39,697 psi | 86% | 2192 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 41,829 psi | 90% | 2300 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 84% | 40,306 psi | 87% | 2188 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 40,234 psi | 87% | 2293 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 39,943 psi | 86% | 2211 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 82% | 40,364 psi | 87% | 2221 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 94% | 41,626 psi | 90% | 2300 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 90% | 41,568 psi | 90% | 2329 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,926 psi | 77% | 2218 fps | 97.1% |
| Bofors RP3 | <<locked>> | 84% | 39,798 psi | 86% | 2221 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 84% | 40,669 psi | 88% | 2218 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 40,712 psi | 88% | 2251 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 40,524 psi | 87% | 2260 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,491 psi | 76% | 1427 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 40,016 psi | 86% | 2175 fps | 97.6% |
| IMR 4831 | <<locked>> | 94% | 40,132 psi | 86% | 2257 fps | 97% |
| IMR 4895 | <<locked>> | 82% | 41,249 psi | 89% | 2247 fps | 98.4% |
| Lovex S062 | <<locked>> | 82% | 40,161 psi | 87% | 2185 fps | 99.1% |
| Lovex S065 | <<locked>> | 90% | 41,713 psi | 90% | 2211 fps | 95.6% |
| Norma 203B | <<locked>> | 82% | 39,726 psi | 86% | 2211 fps | 98% |
| Norma URP | <<locked>> | 94% | 41,684 psi | 90% | 2293 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 84% | 41,336 psi | 89% | 2264 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,984 psi | 78% | 1463 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 41,713 psi | 90% | 2303 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 41,524 psi | 89% | 2336 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 41,249 psi | 89% | 2313 fps | 96.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 41,843 psi | 90% | 2320 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 86% | 39,813 psi | 86% | 2215 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 41,713 psi | 90% | 2211 fps | 95.6% |
| Shooters World Precision | <<locked>> | 82% | 40,161 psi | 87% | 2185 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 40,393 psi | 87% | 2254 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 40,016 psi | 86% | 2123 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 40,611 psi | 88% | 2218 fps | 98.6% |
| Somchem S365 | <<locked>> | 96% | 39,856 psi | 86% | 2300 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 41,089 psi | 89% | 2182 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 41,626 psi | 90% | 2188 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 41,060 psi | 88% | 2201 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 92% | 41,133 psi | 89% | 2247 fps | 96.8% |
| Vihtavuori N540 | <<locked>> | 82% | 40,147 psi | 87% | 2182 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 92% | 40,437 psi | 87% | 2254 fps | 96.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,203 psi | 82% | 2283 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 41,365 psi | 89% | 2231 fps | 98.7% |
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 4064 | <<locked>> | 80% | 37,463 psi | 81% | 2152 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 34,592 psi | 75% | 2165 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 35,984 psi | 78% | 2103 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 37,840 psi | 82% | 2241 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,563 psi | 77% | 2129 fps | 97.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,000 psi | 82% | 2175 fps | 97% |
| Alliant Reloder-16 | 104.8 gr | 88% | 35,186 psi | 76% | 2169 fps | 95.1% |
| Alliant Reloder-17 | 102.6 gr | 80% | 30,777 psi | 66% | 2093 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 96% | 32,198 psi | 69% | 2133 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 35,244 psi | 76% | 2136 fps | 97.9% |
| Hodgdon H380 | <<locked>> | 82% | 38,247 psi | 82% | 2175 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,748 psi | 66% | 2044 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,058 psi | 82% | 2215 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,643 psi | 57% | 1276 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,753 psi | 81% | 2133 fps | 97% |
| IMR 4831 | <<locked>> | 90% | 35,723 psi | 77% | 2172 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 38,798 psi | 84% | 2201 fps | 97.8% |
| Lovex S062 | <<locked>> | 80% | 37,927 psi | 82% | 2142 fps | 98.7% |
| Lovex S065 | <<locked>> | 88% | 39,436 psi | 85% | 2172 fps | 95% |
| Norma 203B | <<locked>> | 80% | 37,391 psi | 81% | 2169 fps | 97.5% |
| Norma URP | <<locked>> | 88% | 35,056 psi | 76% | 2165 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 36,506 psi | 79% | 2172 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,948 psi | 58% | 1306 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,030 psi | 84% | 2254 fps | 97.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,561 psi | 70% | 2149 fps | 98.5% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 36,535 psi | 79% | 2221 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 39,349 psi | 85% | 2270 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 33,388 psi | 72% | 2090 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,436 psi | 85% | 2172 fps | 95% |
| Shooters World Precision | <<locked>> | 80% | 37,927 psi | 82% | 2142 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,779 psi | 73% | 2119 fps | 96.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,592 psi | 77% | 2044 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 34,214 psi | 74% | 2093 fps | 97% |
| Somchem S365 | 99.8 gr | 82% | 26,774 psi | 58% | 1995 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 38,754 psi | 84% | 2142 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,262 psi | 85% | 2149 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,416 psi | 70% | 2041 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 88% | 36,550 psi | 79% | 2162 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 37,855 psi | 82% | 2142 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 35,911 psi | 77% | 2169 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 96% | 34,127 psi | 74% | 2198 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,705 psi | 66% | 2014 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 42 powders for .500 Jeffery Riml. loaded with the .510 | 550gr | Impala RNFP KO. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,336 fps; across all powders the maximum-charge window runs from 1,427 fps to 2,336 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 42 of the 42 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (320 MPa), the top charges use 76–90 %, leaving at least 10 % headroom. Alliant Reloder-23, Hodgdon TrailBoss, ReloadSwiss RS 14 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 Reloder-16, Somchem S365, Alliant Reloder-17 rank at the top here: for .500 Jeffery Riml. with the .510 | 550gr | Impala RNFP KO 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.