Load Specifications
Load data in caliber 7 x 57 R with .284 | 140gr | Impala RNFP KO bullet and 44 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Alliant Reloder-16 and Alliant Reloder-17.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 82% | 42,279 psi | 86% | 2579 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,540 psi | 86% | 2657 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 84% | 42,496 psi | 86% | 2569 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,641 psi | 86% | 2694 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,250 psi | 86% | 2595 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,641 psi | 86% | 2608 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 94% | 44,063 psi | 89% | 2700 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 90% | 44,309 psi | 90% | 2736 fps | 98.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,421 psi | 78% | 2608 fps | 97.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,192 psi | 86% | 2743 fps | 96% |
| Bofors RP3 | <<locked>> | 84% | 42,366 psi | 86% | 2608 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 84% | 43,163 psi | 88% | 2608 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,468 psi | 88% | 2648 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 43,062 psi | 87% | 2651 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,737 psi | 72% | 1699 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 44,614 psi | 90% | 2602 fps | 98.1% |
| IMR 4831 | <<locked>> | 94% | 43,105 psi | 87% | 2648 fps | 97.1% |
| IMR 4895 | <<locked>> | 82% | 43,613 psi | 88% | 2638 fps | 98.3% |
| Lovex S062 | <<locked>> | 82% | 42,192 psi | 86% | 2562 fps | 99% |
| Lovex S065 | <<locked>> | 90% | 44,048 psi | 89% | 2598 fps | 95.7% |
| Norma 203B | <<locked>> | 82% | 41,974 psi | 85% | 2595 fps | 98% |
| Norma URP | <<locked>> | 94% | 44,541 psi | 90% | 2694 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 84% | 43,932 psi | 89% | 2657 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,230 psi | 73% | 1739 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 44,396 psi | 90% | 2707 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 44,193 psi | 90% | 2746 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 44,527 psi | 90% | 2720 fps | 97.1% |
| Rottweil R 902 | <<locked>> | 82% | 44,425 psi | 90% | 2582 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 86% | 42,511 psi | 86% | 2605 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 44,048 psi | 89% | 2598 fps | 95.7% |
| Shooters World Precision | <<locked>> | 82% | 42,192 psi | 86% | 2562 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 42,946 psi | 87% | 2644 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 44,614 psi | 90% | 2536 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 43,279 psi | 88% | 2608 fps | 98.6% |
| Somchem S365 | <<locked>> | 96% | 42,641 psi | 86% | 2700 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 43,613 psi | 88% | 2566 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 43,961 psi | 89% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,743 psi | 89% | 2589 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 92% | 44,048 psi | 89% | 2644 fps | 97% |
| Vihtavuori N540 | <<locked>> | 82% | 42,511 psi | 86% | 2562 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 92% | 43,265 psi | 88% | 2644 fps | 96.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,466 psi | 84% | 2684 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 43,947 psi | 89% | 2618 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,621 psi | 70% | 2589 fps | 96.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 80% | 39,769 psi | 81% | 2530 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 37,246 psi | 76% | 2546 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 37,724 psi | 77% | 2467 fps | 96.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,089 psi | 81% | 2638 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,521 psi | 76% | 2497 fps | 97.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,292 psi | 82% | 2559 fps | 97% |
| Alliant Reloder-16 | 41.4 gr | 88% | 37,159 psi | 75% | 2546 fps | 95.2% |
| Alliant Reloder-17 | 40.6 gr | 80% | 32,721 psi | 66% | 2461 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 34,345 psi | 70% | 2507 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 39,653 psi | 80% | 2684 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 37,594 psi | 76% | 2510 fps | 97.9% |
| Hodgdon H380 | <<locked>> | 82% | 40,582 psi | 82% | 2556 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 32,503 psi | 66% | 2402 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,466 psi | 82% | 2602 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 54% | 1516 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,595 psi | 80% | 2503 fps | 96.9% |
| IMR 4831 | <<locked>> | 90% | 38,203 psi | 77% | 2549 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 41,220 psi | 84% | 2589 fps | 97.8% |
| Lovex S062 | <<locked>> | 80% | 39,914 psi | 81% | 2516 fps | 98.6% |
| Lovex S065 | <<locked>> | 88% | 41,713 psi | 85% | 2549 fps | 95% |
| Norma 203B | <<locked>> | 80% | 39,740 psi | 81% | 2549 fps | 97.4% |
| Norma URP | <<locked>> | 88% | 37,434 psi | 76% | 2543 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 38,841 psi | 79% | 2552 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,180 psi | 55% | 1558 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,553 psi | 84% | 2648 fps | 97.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,621 psi | 70% | 2526 fps | 98.6% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 39,305 psi | 80% | 2612 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 42,032 psi | 85% | 2536 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 80% | 35,360 psi | 72% | 2451 fps | 96.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,713 psi | 85% | 2549 fps | 95% |
| Shooters World Precision | <<locked>> | 80% | 39,914 psi | 81% | 2516 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,752 psi | 73% | 2490 fps | 96.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,579 psi | 76% | 2408 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 36,129 psi | 73% | 2457 fps | 96.9% |
| Somchem S365 | 39.4 gr | 82% | 28,326 psi | 57% | 2343 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 41,089 psi | 83% | 2523 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,336 psi | 84% | 2523 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,258 psi | 69% | 2395 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 88% | 38,870 psi | 79% | 2539 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 39,987 psi | 81% | 2513 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 38,464 psi | 78% | 2546 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 94% | 34,606 psi | 70% | 2533 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 32,401 psi | 66% | 2362 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 98% | 32,663 psi | 66% | 2530 fps | 95.3% |
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 44 powders for 7 x 57 R loaded with the .284 | 140gr | Impala RNFP KO. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,746 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,746 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 44 of the 44 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 70–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, Hodgdon TrailBoss 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. Somchem S365, Alliant Reloder-16, Alliant Reloder-17 rank at the top here: for 7 x 57 R with the .284 | 140gr | Impala RNFP KO 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.