Load Specifications
Load data in caliber 7 x 57 R with .284 | 160gr | Prvi Partizan PSP BT bullet and 46 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, Alliant Reloder-26 and Alliant Reloder-16.
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 3100ᴾ | <<locked>> | 100% | 41,423 psi | 84% | 2480 fps | 96.5% |
| Accurate 4064 | <<locked>> | 82% | 42,322 psi | 86% | 2438 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 43,976 psi | 89% | 2539 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 84% | 43,859 psi | 89% | 2457 fps | 98.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 44,338 psi | 90% | 2589 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 43,555 psi | 88% | 2480 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 82% | 43,918 psi | 89% | 2490 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 92% | 43,033 psi | 87% | 2546 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 88% | 43,352 psi | 88% | 2575 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,479 psi | 80% | 2503 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,135 psi | 90% | 2657 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 43,453 psi | 88% | 2487 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 84% | 44,179 psi | 90% | 2490 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 90% | 43,816 psi | 89% | 2536 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,540 psi | 86% | 2490 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,723 psi | 72% | 1598 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 43,178 psi | 88% | 2438 fps | 99% |
| IMR 4831 | <<locked>> | 92% | 42,076 psi | 85% | 2490 fps | 98.3% |
| Lovex S062 | <<locked>> | 82% | 43,134 psi | 87% | 2441 fps | 99.8% |
| Lovex S065 | <<locked>> | 88% | 42,743 psi | 87% | 2441 fps | 97.1% |
| Lovex S070 | <<locked>> | 90% | 43,163 psi | 88% | 2467 fps | 96% |
| Norma 203B | <<locked>> | 82% | 43,265 psi | 88% | 2480 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 43,700 psi | 89% | 2533 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 82% | 42,960 psi | 87% | 2497 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 92% | 42,844 psi | 87% | 2526 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,172 psi | 73% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,901 psi | 85% | 2425 fps | 96.1% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 42,902 psi | 87% | 2575 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 43,482 psi | 88% | 2559 fps | 98.3% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 43,468 psi | 88% | 2572 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 86% | 43,671 psi | 89% | 2484 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,743 psi | 87% | 2441 fps | 97.1% |
| Shooters World Precision | <<locked>> | 82% | 43,134 psi | 87% | 2441 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 90% | 43,163 psi | 88% | 2467 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 41,959 psi | 85% | 2484 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 43,149 psi | 88% | 2365 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 44,164 psi | 90% | 2484 fps | 99.6% |
| Somchem S365 | <<locked>> | 94% | 41,727 psi | 85% | 2539 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 42,351 psi | 86% | 2425 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 42,772 psi | 87% | 2484 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 82% | 43,497 psi | 88% | 2434 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 42,235 psi | 86% | 2487 fps | 98% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,337 psi | 88% | 2575 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,612 psi | 86% | 2464 fps | 99.6% |
| Winchester 760 | <<locked>> | 90% | 43,816 psi | 89% | 2536 fps | 96.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,273 psi | 72% | 2510 fps | 99.1% |
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 3100 | <<locked>> | 98% | 38,580 psi | 78% | 2425 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 39,842 psi | 81% | 2395 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,344 psi | 68% | 2329 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 38,711 psi | 79% | 2362 fps | 97.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,249 psi | 84% | 2530 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,406 psi | 78% | 2382 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,118 psi | 83% | 2438 fps | 98.6% |
| Alliant Reloder-16 | 38.5 gr | 82% | 31,633 psi | 64% | 2290 fps | 95% |
| Alliant Reloder-17 | 40.5 gr | 80% | 33,083 psi | 67% | 2356 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,167 psi | 59% | 2257 fps | 95.6% |
| Alliant Reloder-26 | 48.8 gr | 94% | 35,839 psi | 73% | 2480 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 37,942 psi | 77% | 2385 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 80% | 38,957 psi | 79% | 2392 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 41,002 psi | 83% | 2484 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,398 psi | 56% | 2152 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,513 psi | 54% | 1421 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,654 psi | 82% | 2392 fps | 98.6% |
| IMR 4831 | <<locked>> | 84% | 32,489 psi | 66% | 2293 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 40,654 psi | 82% | 2395 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,811 psi | 77% | 2346 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 40,466 psi | 82% | 2415 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 40,509 psi | 82% | 2428 fps | 98.9% |
| Norma URP | <<locked>> | 84% | 33,779 psi | 69% | 2333 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 39,987 psi | 81% | 2441 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 37,652 psi | 76% | 2421 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 55% | 1460 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,276 psi | 80% | 2375 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,186 psi | 71% | 2418 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,214 psi | 67% | 2346 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,534 psi | 72% | 2402 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 35,810 psi | 73% | 2336 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,811 psi | 77% | 2346 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 40,654 psi | 82% | 2395 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 40,466 psi | 82% | 2415 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,767 psi | 75% | 2382 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,189 psi | 77% | 2283 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 36,680 psi | 74% | 2339 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 26,600 psi | 54% | 2185 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 34,809 psi | 71% | 2280 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 33,098 psi | 67% | 2287 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 41,031 psi | 83% | 2392 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,664 psi | 70% | 2336 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 31,328 psi | 64% | 2326 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,893 psi | 63% | 2215 fps | 96.8% |
| Winchester 760 | <<locked>> | 88% | 41,002 psi | 83% | 2484 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,124 psi | 59% | 2326 fps | 96.1% |
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 46 powders for 7 x 57 R loaded with the .284 | 160gr | Prvi Partizan PSP BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,657 fps; across all powders the maximum-charge window runs from 1,598 fps to 2,657 fps. Accurate 3100 gives the best case fill at 100 %, and 46 of the 46 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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. Alliant Reloder-17, Alliant Reloder-26, Alliant Reloder-16 rank at the top here: for 7 x 57 R with the .284 | 160gr | Prvi Partizan PSP BT 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.