Load Specifications
Load data in caliber .458 Lott with .458 | 250gr | Barnes TSX FN FB bullet and 30 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, IMR 4227 and Lovex S053.
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% | 52,736 psi | 85% | 2900 fps | 99.2% |
| Accurate 5744 | <<locked>> | 82% | 55,492 psi | 89% | 2982 fps | 99.8% |
| Accurate LT-30ᴾ | <<locked>> | 100% | 52,881 psi | 85% | 2890 fps | 97.3% |
| Accurate No. 11 FS | <<locked>> | 84% | 55,071 psi | 88% | 2917 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 55,317 psi | 89% | 2218 fps | 100% |
| ADI AR 2205 | <<locked>> | 88% | 55,883 psi | 90% | 2838 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 53,432 psi | 86% | 3002 fps | 100% |
| ADI AR 2219ᴾ | <<locked>> | 100% | 49,472 psi | 79% | 2972 fps | 96.4% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 35,114 psi | 56% | 2736 fps | 97.1% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 43,845 psi | 70% | 2877 fps | 98.3% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 56,202 psi | 90% | 3005 fps | 99.8% |
| Baschieri & Pellagri 106ᴾ | <<locked>> | 100% | 50,618 psi | 81% | 2871 fps | 97.2% |
| Hodgdon H4198 | <<locked>> | 98% | 54,998 psi | 88% | 2943 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,820 psi | 48% | 1762 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 47,094 psi | 76% | 2877 fps | 99.3% |
| IMR 4227 | <<locked>> | 94% | 55,187 psi | 88% | 2936 fps | 100% |
| Lovex D060 | <<locked>> | 88% | 55,898 psi | 90% | 2989 fps | 99.8% |
| Lovex D063 | <<locked>> | 84% | 56,188 psi | 90% | 2966 fps | 99.9% |
| Lovex S053 | <<locked>> | 96% | 55,869 psi | 90% | 2927 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 49,835 psi | 80% | 2966 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,240 psi | 47% | 1798 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 54,375 psi | 87% | 2969 fps | 100% |
| Shooters World Blackout | <<locked>> | 84% | 56,188 psi | 90% | 2966 fps | 99.9% |
| Shooters World Buffalo Rifle | <<locked>> | 88% | 55,898 psi | 90% | 2989 fps | 99.8% |
| Shooters World SOCOM | <<locked>> | 86% | 53,737 psi | 86% | 2907 fps | 99.9% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 56,246 psi | 90% | 2772 fps | 100% |
| SNPE Vectan SP 3ᴾ | <<locked>> | 100% | 45,614 psi | 73% | 2881 fps | 96.6% |
| Vihtavuori N110 | <<locked>> | 90% | 55,361 psi | 89% | 2841 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 53,577 psi | 86% | 2953 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 42,699 psi | 68% | 2782 fps | 97.7% |
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 1680 | <<locked>> | 80% | 32,938 psi | 53% | 2526 fps | 95% |
| Accurate 5744 | <<locked>> | 80% | 52,054 psi | 83% | 2927 fps | 99.6% |
| Accurate LT-30 | <<locked>> | 94% | 43,903 psi | 70% | 2736 fps | 95.3% |
| Accurate No. 11 FS | <<locked>> | 80% | 48,370 psi | 78% | 2818 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 53,316 psi | 85% | 2188 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 43,729 psi | 70% | 2657 fps | 100% |
| ADI AR 2207 | <<locked>> | 80% | 28,239 psi | 45% | 2507 fps | 97.6% |
| ADI AR 2219 | <<locked>> | 98% | 46,296 psi | 74% | 2913 fps | 95.6% |
| Alliant AR-Comp | <<locked>> | 96% | 30,995 psi | 50% | 2628 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 92% | 34,055 psi | 55% | 2671 fps | 95.7% |
| Alliant Reloder-7 | <<locked>> | 82% | 31,923 psi | 51% | 2546 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 94% | 41,640 psi | 67% | 2717 fps | 95.1% |
| Hodgdon H4198 | <<locked>> | 92% | 45,803 psi | 73% | 2789 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,640 psi | 35% | 1572 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 31,488 psi | 50% | 2539 fps | 95.5% |
| IMR 4227 | 61.4 gr | 80% | 35,984 psi | 58% | 2598 fps | 98.5% |
| Lovex D060 | <<locked>> | 80% | 44,019 psi | 71% | 2779 fps | 98.7% |
| Lovex D063 | <<locked>> | 80% | 49,066 psi | 79% | 2858 fps | 99.4% |
| Lovex S053 | 60.2 gr | 80% | 35,056 psi | 56% | 2575 fps | 99.9% |
| Norma 200 | <<locked>> | 86% | 31,618 psi | 51% | 2598 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,205 psi | 34% | 1604 fps | 100% |
| ReloadSwiss RS 36 | 65.3 gr | 80% | 34,983 psi | 56% | 2618 fps | 98.1% |
| Shooters World Blackout | <<locked>> | 80% | 49,066 psi | 79% | 2858 fps | 99.4% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 44,019 psi | 71% | 2779 fps | 98.7% |
| Shooters World SOCOM | <<locked>> | 80% | 43,947 psi | 70% | 2749 fps | 99.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 32,982 psi | 53% | 2411 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 96% | 40,277 psi | 65% | 2776 fps | 95.1% |
| Vihtavuori N110 | <<locked>> | 80% | 41,307 psi | 66% | 2635 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 28,587 psi | 46% | 2484 fps | 98.7% |
| Vihtavuori N130 | <<locked>> | 92% | 33,373 psi | 54% | 2585 fps | 95% |
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 30 powders for .458 Lott loaded with the .458 | 250gr | Barnes TSX FN FB. Alliant Reloder-7 delivers the highest muzzle velocity at 3,005 fps; across all powders the maximum-charge window runs from 1,762 fps to 3,005 fps. Accurate LT-30 gives the best case fill at 100 %, and 30 of the 30 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 47–90 %, leaving at least 10 % headroom. Accurate LT-30, ADI AR 2207, ADI AR 2219 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. ReloadSwiss RS 36, IMR 4227, Lovex S053 rank at the top here: for .458 Lott with the .458 | 250gr | Barnes TSX FN FB 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.