Load Specifications
Load data in caliber 7 x 57 R with .285 | 139gr | Prvi Partizan SP bullet and 46 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, ReloadSwiss RS 70 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.
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Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 43,584 psi | 88% | 2625 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 43,772 psi | 89% | 2664 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,569 psi | 86% | 2713 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 84% | 42,685 psi | 87% | 2635 fps | 97.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,946 psi | 87% | 2762 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,424 psi | 86% | 2657 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,598 psi | 86% | 2664 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 94% | 44,556 psi | 90% | 2772 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 41,887 psi | 85% | 2743 fps | 98.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,551 psi | 78% | 2671 fps | 98% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,772 psi | 87% | 2822 fps | 97.1% |
| Bofors RP3 | <<locked>> | 84% | 42,250 psi | 86% | 2664 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 84% | 42,960 psi | 87% | 2664 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,874 psi | 89% | 2710 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 43,366 psi | 88% | 2713 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,346 psi | 72% | 1742 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,177 psi | 86% | 2615 fps | 98% |
| IMR 4831 | <<locked>> | 94% | 43,555 psi | 88% | 2713 fps | 97.7% |
| IMR 4895 | <<locked>> | 82% | 43,642 psi | 89% | 2697 fps | 98.7% |
| Lovex S062 | <<locked>> | 82% | 42,134 psi | 85% | 2621 fps | 99.3% |
| Lovex S065 | <<locked>> | 90% | 44,106 psi | 89% | 2661 fps | 96.4% |
| Norma 203B | <<locked>> | 82% | 41,916 psi | 85% | 2651 fps | 98.4% |
| Norma URP | <<locked>> | 92% | 42,569 psi | 86% | 2710 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 82% | 41,539 psi | 84% | 2664 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 94% | 44,469 psi | 90% | 2753 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,969 psi | 73% | 1788 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 41,713 psi | 85% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 42,192 psi | 86% | 2730 fps | 97% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,221 psi | 86% | 2740 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 82% | 44,005 psi | 89% | 2638 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 86% | 42,119 psi | 85% | 2654 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 44,106 psi | 89% | 2661 fps | 96.4% |
| Shooters World Precision | <<locked>> | 82% | 42,134 psi | 85% | 2621 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,439 psi | 88% | 2710 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,206 psi | 86% | 2549 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,844 psi | 87% | 2657 fps | 98.9% |
| Somchem S365 | <<locked>> | 96% | 43,236 psi | 88% | 2766 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 43,453 psi | 88% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 44,164 psi | 90% | 2628 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,845 psi | 89% | 2648 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 92% | 44,512 psi | 90% | 2710 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 82% | 42,569 psi | 86% | 2618 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,613 psi | 88% | 2710 fps | 97.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,047 psi | 85% | 2749 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 41,626 psi | 84% | 2631 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,418 psi | 70% | 2654 fps | 97.4% |
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 2495 | <<locked>> | 80% | 40,857 psi | 83% | 2575 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,638 psi | 78% | 2569 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 37,101 psi | 75% | 2598 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 37,550 psi | 76% | 2523 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,118 psi | 81% | 2700 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,275 psi | 76% | 2549 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,045 psi | 81% | 2612 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,027 psi | 71% | 2556 fps | 95% |
| Alliant Reloder-17 | 44.1 gr | 80% | 32,053 psi | 65% | 2503 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 32,068 psi | 65% | 2503 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 37,289 psi | 76% | 2690 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 36,796 psi | 75% | 2549 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 80% | 37,724 psi | 77% | 2552 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 32,111 psi | 65% | 2451 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,770 psi | 83% | 2661 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,426 psi | 54% | 1558 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,421 psi | 80% | 2559 fps | 97.4% |
| IMR 4831 | <<locked>> | 88% | 35,868 psi | 73% | 2552 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 41,031 psi | 83% | 2644 fps | 98.2% |
| Lovex S062 | <<locked>> | 80% | 39,363 psi | 80% | 2566 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 41,568 psi | 84% | 2608 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 39,436 psi | 80% | 2602 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 37,347 psi | 76% | 2598 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 38,812 psi | 79% | 2608 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 92% | 41,626 psi | 84% | 2694 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,818 psi | 54% | 1598 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,127 psi | 69% | 2575 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,825 psi | 75% | 2615 fps | 95.3% |
| ReloadSwiss RS 70 | 50.4 gr | 90% | 39,537 psi | 80% | 2677 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 41,379 psi | 84% | 2585 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 34,664 psi | 70% | 2493 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,568 psi | 84% | 2608 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 39,363 psi | 80% | 2566 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,520 psi | 72% | 2539 fps | 96.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,217 psi | 75% | 2454 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,636 psi | 72% | 2503 fps | 97.2% |
| Somchem S365 | 42.9 gr | 82% | 27,514 psi | 56% | 2379 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 40,756 psi | 83% | 2572 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,307 psi | 84% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,750 psi | 68% | 2441 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 36,463 psi | 74% | 2543 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 39,856 psi | 81% | 2566 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 38,421 psi | 78% | 2602 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 94% | 34,476 psi | 70% | 2582 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,052 psi | 61% | 2359 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 32,213 psi | 65% | 2585 fps | 96.2% |
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 72 powders for 7 x 57 R loaded with the .285 | 139gr | Prvi Partizan SP. Alliant Reloder-26 delivers the highest muzzle velocity at 2,822 fps; across all powders the maximum-charge window runs from 1,742 fps to 2,822 fps. Accurate 3100 gives the best case fill at 100 %, and 72 of the 72 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 67–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.285" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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, ReloadSwiss RS 70, Alliant Reloder-17 rank at the top here: for 7 x 57 R with the .285 | 139gr | Prvi Partizan SP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 3100, ADI AR 2209 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.