Load Specifications
Load data in caliber .510 Whisper with .510 | 370gr | Impala LWHV LS bullet and 13 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2207, ReloadSwiss RS 36 and Vihtavuori N120.
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: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 82% | 43,903 psi | 88% | 2080 fps | 99.7% |
| ADI AR 2207 | <<locked>> | 98% | 45,005 psi | 90% | 2254 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,168 psi | 60% | 1362 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 45,107 psi | 90% | 2169 fps | 97.8% |
| Lovex D060 | <<locked>> | 82% | 43,918 psi | 88% | 2156 fps | 95.8% |
| Lovex S053 | <<locked>> | 90% | 43,888 psi | 88% | 2152 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,849 psi | 60% | 1394 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 43,874 psi | 88% | 2188 fps | 97.3% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 43,918 psi | 88% | 2156 fps | 95.8% |
| Shooters World SOCOM | <<locked>> | 82% | 43,526 psi | 87% | 2136 fps | 96.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 94% | 45,223 psi | 90% | 2073 fps | 100% |
| Vihtavuori N110 | <<locked>> | 84% | 43,961 psi | 88% | 2103 fps | 100% |
| Vihtavuori N120 | <<locked>> | 98% | 45,281 psi | 90% | 2231 fps | 99.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 80% | 41,481 psi | 83% | 2044 fps | 99.5% |
| ADI AR 2207 | 59.4 gr | 86% | 32,227 psi | 64% | 2021 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,394 psi | 45% | 1214 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 36,114 psi | 72% | 2014 fps | 95.5% |
| Lovex D060 | <<locked>> | 80% | 41,466 psi | 83% | 2113 fps | 95.1% |
| Lovex S053 | <<locked>> | 80% | 33,692 psi | 67% | 1972 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,147 psi | 44% | 1243 fps | 100% |
| ReloadSwiss RS 36 | 60.3 gr | 84% | 36,941 psi | 74% | 2067 fps | 95.5% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 41,466 psi | 83% | 2113 fps | 95.1% |
| Shooters World SOCOM | <<locked>> | 80% | 40,799 psi | 82% | 2090 fps | 95.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 31,937 psi | 64% | 1864 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 39,523 psi | 79% | 2037 fps | 100% |
| Vihtavuori N120 | 56.6 gr | 82% | 29,211 psi | 58% | 1929 fps | 95.7% |
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 19 powders for .510 Whisper loaded with the .510 | 370gr | Impala LWHV LS. ADI AR 2207 delivers the highest muzzle velocity at 2,254 fps; across all powders the maximum-charge window runs from 1,362 fps to 2,254 fps. Alliant Reloder-10x gives the best case fill at 100 %, and 19 of the 19 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (345 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. Alliant Reloder-10x, Hodgdon TrailBoss, IMR 4198 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. ADI AR 2207, ReloadSwiss RS 36, Vihtavuori N120 rank at the top here: for .510 Whisper with the .510 | 370gr | Impala LWHV LS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, Alliant Reloder-10x, Vihtavuori N130 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.