Load Specifications
Load data in caliber .458 Lott with .458 | 250gr | TWENTY-NINE HP bullet and 31 powders. The key underlying parameters are shown in the table above.
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 1680 | <<locked>> | 94% | 53,824 psi | 86% | 2910 fps | 99.3% |
| Accurate 2015ᴾ | <<locked>> | 100% | 38,754 psi | 62% | 2743 fps | 95.8% |
| Accurate 5744 | <<locked>> | 82% | 56,362 psi | 90% | 2989 fps | 99.9% |
| Accurate LT-30ᴾ | <<locked>> | 100% | 53,867 psi | 86% | 2900 fps | 97.4% |
| Accurate No. 11 FS | <<locked>> | 84% | 56,144 psi | 90% | 2923 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 55,477 psi | 89% | 2218 fps | 100% |
| ADI AR 2205 | <<locked>> | 86% | 53,519 psi | 86% | 2802 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 54,665 psi | 88% | 3012 fps | 100% |
| ADI AR 2219ᴾ | <<locked>> | 100% | 50,589 psi | 81% | 2982 fps | 96.6% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 36,201 psi | 58% | 2756 fps | 97.5% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 45,092 psi | 72% | 2894 fps | 98.5% |
| Alliant Reloder-7 | <<locked>> | 98% | 54,128 psi | 87% | 2969 fps | 99.7% |
| Baschieri & Pellagri 106ᴾ | <<locked>> | 100% | 51,663 psi | 83% | 2884 fps | 97.3% |
| Hodgdon H4198 | <<locked>> | 98% | 56,014 psi | 90% | 2949 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,269 psi | 49% | 1762 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 48,095 psi | 77% | 2887 fps | 99.4% |
| IMR 4227 | <<locked>> | 94% | 56,144 psi | 90% | 2946 fps | 100% |
| Lovex D060 | <<locked>> | 86% | 53,534 psi | 86% | 2943 fps | 99.7% |
| Lovex D063 | <<locked>> | 82% | 53,388 psi | 86% | 2920 fps | 99.7% |
| Lovex S053 | <<locked>> | 94% | 53,896 psi | 86% | 2894 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 51,488 psi | 83% | 2982 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,805 psi | 48% | 1801 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 55,477 psi | 89% | 2979 fps | 100% |
| Shooters World Blackout | <<locked>> | 82% | 53,388 psi | 86% | 2920 fps | 99.7% |
| Shooters World Buffalo Rifle | <<locked>> | 86% | 53,534 psi | 86% | 2943 fps | 99.7% |
| Shooters World SOCOM | <<locked>> | 86% | 54,694 psi | 88% | 2917 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 54,375 psi | 87% | 2743 fps | 100% |
| SNPE Vectan SP 3ᴾ | <<locked>> | 100% | 46,702 psi | 75% | 2894 fps | 96.8% |
| Vihtavuori N110 | <<locked>> | 88% | 53,461 psi | 86% | 2808 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 54,781 psi | 88% | 2963 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 43,888 psi | 70% | 2795 fps | 97.9% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 80% | 33,997 psi | 55% | 2543 fps | 95.4% |
| Accurate 2015 | <<locked>> | 98% | 36,376 psi | 58% | 2690 fps | 95% |
| Accurate 5744 | <<locked>> | 80% | 52,968 psi | 85% | 2936 fps | 99.7% |
| Accurate LT-30 | <<locked>> | 94% | 44,889 psi | 72% | 2749 fps | 95.6% |
| Accurate No. 11 FS | <<locked>> | 80% | 49,429 psi | 79% | 2828 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 53,490 psi | 86% | 2188 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 44,614 psi | 72% | 2667 fps | 100% |
| ADI AR 2207 | <<locked>> | 80% | 29,356 psi | 47% | 2523 fps | 97.9% |
| ADI AR 2219 | <<locked>> | 96% | 44,266 psi | 71% | 2867 fps | 95% |
| Alliant AR-Comp | <<locked>> | 96% | 32,111 psi | 51% | 2648 fps | 95.9% |
| Alliant Reloder-10x | <<locked>> | 90% | 33,156 psi | 53% | 2638 fps | 95.3% |
| Alliant Reloder-7 | <<locked>> | 80% | 31,154 psi | 50% | 2516 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 94% | 42,627 psi | 68% | 2730 fps | 95.3% |
| Hodgdon H4198 | <<locked>> | 92% | 46,789 psi | 75% | 2802 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,118 psi | 35% | 1575 fps | 100% |
| IMR 4198 | <<locked>> | 84% | 30,589 psi | 49% | 2503 fps | 95.1% |
| IMR 4227 | <<locked>> | 80% | 36,970 psi | 59% | 2612 fps | 98.6% |
| Lovex D060 | <<locked>> | 80% | 44,846 psi | 72% | 2789 fps | 98.8% |
| Lovex D063 | <<locked>> | 80% | 50,009 psi | 80% | 2867 fps | 99.5% |
| Lovex S053 | <<locked>> | 80% | 36,114 psi | 58% | 2589 fps | 100% |
| Norma 200 | <<locked>> | 84% | 31,111 psi | 50% | 2572 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,741 psi | 35% | 1608 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 36,013 psi | 58% | 2631 fps | 98.3% |
| Shooters World Blackout | <<locked>> | 80% | 50,009 psi | 80% | 2867 fps | 99.5% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 44,846 psi | 72% | 2789 fps | 98.8% |
| Shooters World SOCOM | <<locked>> | 80% | 44,860 psi | 72% | 2756 fps | 99.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 33,968 psi | 54% | 2421 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 96% | 41,278 psi | 66% | 2789 fps | 95.4% |
| Vihtavuori N110 | <<locked>> | 80% | 42,525 psi | 68% | 2644 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 29,646 psi | 48% | 2500 fps | 98.9% |
| Vihtavuori N130 | <<locked>> | 92% | 34,476 psi | 55% | 2602 fps | 95.4% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 31 powders for .458 Lott loaded with the .458 | 250gr | TWENTY-NINE HP. ADI AR 2207 delivers the highest muzzle velocity at 3,012 fps; across all powders the maximum-charge window runs from 1,762 fps to 3,012 fps. Accurate 2015 gives the best case fill at 100 %, and 31 of the 31 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 48–90 %, leaving at least 10 % headroom. Accurate 2015, Accurate LT-30, ADI AR 2207 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.