Load Specifications
Load data in caliber .510 Whisper with .510 | 450gr | Alaska Bullet Works Kodiak FN SPBC bullet and 16 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma 200, ADI AR 2207 and Alliant Reloder-7.
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 |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 88% | 43,308 psi | 87% | 1965 fps | 97.2% |
| ADI AR 2207 | <<locked>> | 94% | 44,570 psi | 89% | 2051 fps | 99.9% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 35,273 psi | 70% | 1959 fps | 96.1% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 44,092 psi | 88% | 2064 fps | 97.6% |
| Alliant Reloder-7 | <<locked>> | 92% | 44,179 psi | 88% | 2011 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,356 psi | 61% | 1240 fps | 100% |
| IMR 4198 | <<locked>> | 98% | 44,701 psi | 89% | 2028 fps | 98.5% |
| IMR 4227 | <<locked>> | 86% | 43,743 psi | 87% | 1965 fps | 99.3% |
| Lovex S053 | <<locked>> | 88% | 44,933 psi | 90% | 1975 fps | 100% |
| Norma 200 | <<locked>> | 96% | 44,179 psi | 88% | 2057 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,994 psi | 60% | 1270 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 86% | 42,714 psi | 85% | 1985 fps | 99.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 90% | 43,888 psi | 88% | 1857 fps | 100% |
| Vihtavuori N110 | <<locked>> | 82% | 44,730 psi | 89% | 1916 fps | 100% |
| Vihtavuori N120 | <<locked>> | 94% | 44,802 psi | 90% | 2024 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 42,757 psi | 85% | 1995 fps | 96.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 82% | 35,723 psi | 71% | 1847 fps | 95.1% |
| ADI AR 2207 | 55.2 gr | 80% | 29,037 psi | 58% | 1788 fps | 97.1% |
| Alliant AR-Comp | <<locked>> | 98% | 33,272 psi | 66% | 1919 fps | 95.2% |
| Alliant Reloder-10x | <<locked>> | 94% | 36,753 psi | 73% | 1949 fps | 95.7% |
| Alliant Reloder-7 | 60 gr | 84% | 34,737 psi | 69% | 1860 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,234 psi | 44% | 1102 fps | 100% |
| IMR 4198 | <<locked>> | 88% | 33,924 psi | 68% | 1850 fps | 95.6% |
| IMR 4227 | <<locked>> | 80% | 36,637 psi | 73% | 1854 fps | 98.1% |
| Lovex S053 | <<locked>> | 80% | 35,781 psi | 72% | 1841 fps | 99.8% |
| Norma 200 | 62.1 gr | 86% | 32,460 psi | 65% | 1864 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,944 psi | 44% | 1129 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 35,563 psi | 71% | 1870 fps | 97.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 33,808 psi | 68% | 1722 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 42,119 psi | 84% | 1883 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 29,283 psi | 59% | 1775 fps | 98.3% |
| Vihtavuori N130 | <<locked>> | 96% | 38,000 psi | 76% | 1923 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 29 powders for .510 Whisper loaded with the .510 | 450gr | Alaska Bullet Works Kodiak FN SPBC. Hodgdon H335 delivers the highest muzzle velocity at 2,073 fps; across all powders the maximum-charge window runs from 1,240 fps to 2,073 fps. Accurate 2015 gives the best case fill at 100 %, and 29 of the 29 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. Accurate 2015, Accurate 2460, Alliant AR-Comp 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. Norma 200, ADI AR 2207, Alliant Reloder-7 rank at the top here: for .510 Whisper with the .510 | 450gr | Alaska Bullet Works Kodiak FN SPBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2015, Accurate 2460, Accurate LT-30 burn incompletely and react more sensitively to barrel length and temperature. Hodgdon TrailBoss stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.