Load Specifications
Load data in caliber 7 x 57 R with .284 | 145gr | Prvi Partizan SP bullet and 47 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% | 42,888 psi | 87% | 2546 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 43,207 psi | 88% | 2589 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,003 psi | 85% | 2638 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 84% | 42,192 psi | 86% | 2556 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,438 psi | 86% | 2684 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 44,411 psi | 90% | 2628 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,090 psi | 85% | 2589 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 94% | 44,063 psi | 89% | 2697 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 90% | 44,367 psi | 90% | 2730 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,913 psi | 77% | 2595 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,279 psi | 86% | 2746 fps | 97.1% |
| Bofors RP3 | <<locked>> | 86% | 44,411 psi | 90% | 2638 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 84% | 42,670 psi | 87% | 2592 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,395 psi | 88% | 2638 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 43,047 psi | 87% | 2641 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,259 psi | 72% | 1686 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 44,338 psi | 90% | 2592 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 43,076 psi | 87% | 2641 fps | 97.8% |
| IMR 4895 | <<locked>> | 82% | 43,120 psi | 87% | 2618 fps | 98.8% |
| Lovex S062 | <<locked>> | 84% | 44,222 psi | 90% | 2595 fps | 99.6% |
| Lovex S065 | <<locked>> | 90% | 43,685 psi | 89% | 2585 fps | 96.4% |
| Norma 203B | <<locked>> | 84% | 44,164 psi | 90% | 2631 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 41,989 psi | 85% | 2635 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 84% | 44,034 psi | 89% | 2651 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 94% | 43,656 psi | 89% | 2671 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,911 psi | 73% | 1732 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 44,512 psi | 90% | 2697 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 44,106 psi | 89% | 2733 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 44,396 psi | 90% | 2707 fps | 97.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,814 psi | 85% | 2664 fps | 96.4% |
| Rottweil R 902 | <<locked>> | 82% | 43,613 psi | 88% | 2562 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 88% | 44,614 psi | 90% | 2635 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,685 psi | 89% | 2585 fps | 96.4% |
| Shooters World Precision | <<locked>> | 84% | 44,222 psi | 90% | 2595 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,062 psi | 87% | 2638 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 44,396 psi | 90% | 2520 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,467 psi | 86% | 2585 fps | 98.9% |
| Somchem S365 | <<locked>> | 96% | 42,598 psi | 86% | 2690 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 42,931 psi | 87% | 2543 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 43,642 psi | 89% | 2552 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,366 psi | 88% | 2572 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 92% | 43,990 psi | 89% | 2635 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 82% | 41,901 psi | 85% | 2539 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,207 psi | 88% | 2635 fps | 97.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,176 psi | 84% | 2667 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 44,034 psi | 89% | 2615 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,837 psi | 69% | 2579 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% | 40,393 psi | 82% | 2503 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,159 psi | 77% | 2497 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 36,593 psi | 74% | 2526 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 37,188 psi | 75% | 2454 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,827 psi | 81% | 2628 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,883 psi | 75% | 2477 fps | 98.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,479 psi | 80% | 2536 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,476 psi | 70% | 2480 fps | 95% |
| Alliant Reloder-17 | 42.2 gr | 80% | 31,778 psi | 64% | 2438 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,488 psi | 64% | 2431 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,695 psi | 74% | 2615 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 36,506 psi | 74% | 2480 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 80% | 37,289 psi | 76% | 2480 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,791 psi | 60% | 2333 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,074 psi | 81% | 2582 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,455 psi | 54% | 1512 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,986 psi | 79% | 2487 fps | 97.4% |
| IMR 4831 | <<locked>> | 88% | 35,389 psi | 72% | 2480 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 40,451 psi | 82% | 2566 fps | 98.3% |
| Lovex S062 | <<locked>> | 80% | 38,928 psi | 79% | 2493 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 41,046 psi | 83% | 2536 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 38,870 psi | 79% | 2526 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 36,869 psi | 75% | 2526 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 38,508 psi | 78% | 2539 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 41,060 psi | 83% | 2618 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,629 psi | 54% | 1545 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,336 psi | 84% | 2635 fps | 97.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,808 psi | 69% | 2503 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,332 psi | 74% | 2539 fps | 95.4% |
| ReloadSwiss RS 70 | 48.2 gr | 90% | 39,059 psi | 79% | 2605 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 40,944 psi | 83% | 2513 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 34,272 psi | 70% | 2425 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,046 psi | 83% | 2536 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 38,928 psi | 79% | 2493 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,085 psi | 71% | 2467 fps | 96.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,724 psi | 74% | 2382 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,244 psi | 71% | 2434 fps | 97.3% |
| Somchem S365 | 41 gr | 82% | 27,122 psi | 55% | 2310 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 40,161 psi | 81% | 2493 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,930 psi | 83% | 2507 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,402 psi | 68% | 2372 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 35,955 psi | 73% | 2470 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 39,378 psi | 80% | 2493 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 35,520 psi | 72% | 2474 fps | 95% |
| Vihtavuori N555 | <<locked>> | 94% | 33,765 psi | 68% | 2507 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,675 psi | 60% | 2293 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 31,778 psi | 64% | 2513 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 47 powders for 7 x 57 R loaded with the .284 | 145gr | Prvi Partizan SP. Alliant Reloder-26 delivers the highest muzzle velocity at 2,746 fps; across all powders the maximum-charge window runs from 1,686 fps to 2,746 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.284" calls for a 1:13.0 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, ReloadSwiss RS 70, Alliant Reloder-17 rank at the top here: for 7 x 57 R with the .284 | 145gr | Prvi Partizan SP 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.