Load Specifications
Load data in caliber .500 Jeffery Riml. with .510 | 570gr | A-Square LionLoad bullet and 36 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Alliant Reloder-16 and Somchem S365.
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 3100ᴾ | <<locked>> | 100% | 41,887 psi | 90% | 2326 fps | 97.2% |
| Accurate 4350 | <<locked>> | 90% | 41,640 psi | 90% | 2333 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 82% | 41,655 psi | 90% | 2251 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 41,423 psi | 89% | 2274 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 90% | 41,133 psi | 89% | 2343 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 86% | 40,915 psi | 88% | 2362 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,030 psi | 86% | 2352 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 41,597 psi | 90% | 2441 fps | 98.5% |
| Bofors RP3 | <<locked>> | 82% | 41,220 psi | 89% | 2280 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 82% | 41,945 psi | 90% | 2283 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 88% | 41,466 psi | 89% | 2326 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 40,408 psi | 87% | 2287 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,665 psi | 77% | 1473 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 40,045 psi | 86% | 2290 fps | 98.4% |
| Lovex S065 | <<locked>> | 86% | 40,553 psi | 87% | 2238 fps | 97.1% |
| Lovex S070 | <<locked>> | 88% | 41,002 psi | 88% | 2264 fps | 96.1% |
| Norma URP | <<locked>> | 90% | 41,568 psi | 90% | 2326 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 40,509 psi | 87% | 2316 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,260 psi | 78% | 1509 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 40,741 psi | 88% | 2362 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 41,191 psi | 89% | 2349 fps | 98.3% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 41,089 psi | 89% | 2362 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 84% | 41,307 psi | 89% | 2277 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,553 psi | 87% | 2238 fps | 97.1% |
| Shooters World SW4350 | <<locked>> | 88% | 41,002 psi | 88% | 2264 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 39,726 psi | 86% | 2277 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 41,104 psi | 89% | 2169 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 39,552 psi | 85% | 2234 fps | 99.4% |
| Somchem S365 | <<locked>> | 92% | 39,668 psi | 85% | 2333 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 40,074 psi | 86% | 2221 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 88% | 40,785 psi | 88% | 2280 fps | 98.3% |
| Vihtavuori N550 | <<locked>> | 88% | 40,059 psi | 86% | 2283 fps | 98% |
| Vihtavuori N555 | <<locked>> | 98% | 41,220 psi | 89% | 2372 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 40,480 psi | 87% | 2264 fps | 99.6% |
| Winchester 760 | <<locked>> | 88% | 41,640 psi | 90% | 2329 fps | 96.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,737 psi | 77% | 2362 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 3100 | <<locked>> | 96% | 36,579 psi | 79% | 2228 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 29,573 psi | 64% | 2090 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 39,146 psi | 84% | 2205 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,870 psi | 84% | 2228 fps | 99.5% |
| Alliant Reloder-16 | 111.1 gr | 80% | 30,255 psi | 65% | 2103 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,489 psi | 72% | 2208 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,804 psi | 60% | 2073 fps | 95.7% |
| Alliant Reloder-26 | 141 gr | 92% | 33,837 psi | 73% | 2277 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 38,566 psi | 83% | 2234 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 80% | 39,305 psi | 85% | 2238 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 38,856 psi | 84% | 2277 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,702 psi | 60% | 2018 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,600 psi | 57% | 1312 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 30,835 psi | 66% | 2103 fps | 95.6% |
| Lovex S065 | <<locked>> | 82% | 35,940 psi | 77% | 2149 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 38,566 psi | 83% | 2221 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 30,124 psi | 65% | 2093 fps | 95% |
| Ramshot Hunter | <<locked>> | 86% | 35,650 psi | 77% | 2221 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,035 psi | 58% | 1345 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,621 psi | 77% | 2264 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 31,459 psi | 68% | 2152 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 33,736 psi | 73% | 2205 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 36,303 psi | 78% | 2185 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,940 psi | 77% | 2149 fps | 95.7% |
| Shooters World SW4350 | <<locked>> | 86% | 38,566 psi | 83% | 2221 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,202 psi | 80% | 2231 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,653 psi | 83% | 2129 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 37,144 psi | 80% | 2188 fps | 99% |
| Somchem S365 | 113.4 gr | 80% | 26,992 psi | 58% | 2051 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 80% | 35,244 psi | 76% | 2133 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 31,386 psi | 68% | 2093 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 30,879 psi | 67% | 2096 fps | 95% |
| Vihtavuori N555 | <<locked>> | 88% | 29,820 psi | 64% | 2139 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,125 psi | 67% | 2073 fps | 97.5% |
| Winchester 760 | <<locked>> | 86% | 38,972 psi | 84% | 2280 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,746 psi | 60% | 2142 fps | 96.2% |
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 62 powders for .500 Jeffery Riml. loaded with the .510 | 570gr | A-Square LionLoad. Alliant Reloder-26 delivers the highest muzzle velocity at 2,441 fps; across all powders the maximum-charge window runs from 1,473 fps to 2,441 fps. Accurate 3100 gives the best case fill at 100 %, and 62 of the 62 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (320 MPa), the top charges use 75–90 %, leaving at least 10 % headroom. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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-26, Alliant Reloder-16, Somchem S365 rank at the top here: for .500 Jeffery Riml. with the .510 | 570gr | A-Square LionLoad they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, ADI AR 2213, Alliant Reloder-19 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.