Load Specifications
Load data in caliber 7 x 57 R with .285 | 173gr | Prvi Partizan FMJ BT bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Alliant Reloder-16 and Vihtavuori N555.
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 3100 | <<locked>> | 98% | 42,134 psi | 85% | 2405 fps | 97.6% |
| Accurate 4350 | <<locked>> | 90% | 44,527 psi | 90% | 2457 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 82% | 43,700 psi | 89% | 2365 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 43,656 psi | 89% | 2385 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 43,468 psi | 88% | 2464 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 43,395 psi | 88% | 2484 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,685 psi | 87% | 2477 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,623 psi | 76% | 2392 fps | 96.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 44,570 psi | 90% | 2579 fps | 99.3% |
| Bofors RP3 | <<locked>> | 82% | 43,729 psi | 89% | 2395 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 44,092 psi | 89% | 2372 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 82% | 44,266 psi | 90% | 2402 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 88% | 43,918 psi | 89% | 2448 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 42,902 psi | 87% | 2405 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 43,613 psi | 88% | 2470 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,969 psi | 73% | 1539 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 44,454 psi | 90% | 2402 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,931 psi | 87% | 2352 fps | 96.6% |
| IMR 4831 | <<locked>> | 90% | 42,525 psi | 86% | 2408 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 42,815 psi | 87% | 2356 fps | 98% |
| Lovex S070 | <<locked>> | 88% | 43,337 psi | 88% | 2385 fps | 97.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,449 psi | 76% | 2320 fps | 96.3% |
| Norma MRP | <<locked>> | 98% | 44,454 psi | 90% | 2539 fps | 97.1% |
| Norma URP | <<locked>> | 90% | 44,106 psi | 89% | 2448 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 90% | 42,902 psi | 87% | 2441 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,492 psi | 74% | 1575 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 44,425 psi | 90% | 2385 fps | 97.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 43,221 psi | 88% | 2484 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 44,208 psi | 90% | 2477 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 43,439 psi | 88% | 2490 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 84% | 43,903 psi | 89% | 2395 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 44,092 psi | 89% | 2372 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 42,815 psi | 87% | 2356 fps | 98% |
| Shooters World SW4350 | <<locked>> | 88% | 43,337 psi | 88% | 2385 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 41,989 psi | 85% | 2392 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 43,221 psi | 88% | 2274 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,206 psi | 86% | 2306 fps | 96.6% |
| Somchem S355 | <<locked>> | 84% | 44,266 psi | 90% | 2392 fps | 99.9% |
| Somchem S365 | <<locked>> | 92% | 42,351 psi | 86% | 2454 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 42,032 psi | 85% | 2395 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 84% | 42,453 psi | 86% | 2333 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 43,105 psi | 87% | 2398 fps | 99% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 43,976 psi | 89% | 2418 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 88% | 42,612 psi | 86% | 2405 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 98% | 44,208 psi | 90% | 2493 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 42,815 psi | 87% | 2379 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 44,251 psi | 90% | 2454 fps | 97.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,203 psi | 77% | 2503 fps | 100% |
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>> | 92% | 34,403 psi | 70% | 2257 fps | 95.3% |
| Accurate 4350 | <<locked>> | 80% | 31,705 psi | 64% | 2205 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 80% | 40,930 psi | 83% | 2316 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,872 psi | 83% | 2339 fps | 99.8% |
| Alliant Reloder-16 | 37.7 gr | 80% | 31,923 psi | 65% | 2218 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,549 psi | 72% | 2329 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 84% | 26,078 psi | 53% | 2093 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,273 psi | 72% | 2339 fps | 95.9% |
| Alliant Reloder-26 | 45.7 gr | 88% | 31,517 psi | 64% | 2293 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 40,872 psi | 83% | 2349 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 41,597 psi | 84% | 2326 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 41,452 psi | 84% | 2352 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 38,711 psi | 79% | 2349 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,298 psi | 59% | 2126 fps | 97.1% |
| Hodgdon Superformance | <<locked>> | 86% | 40,582 psi | 82% | 2415 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,731 psi | 54% | 1371 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 39,073 psi | 79% | 2303 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,000 psi | 77% | 2257 fps | 95.1% |
| IMR 4831 | <<locked>> | 80% | 30,734 psi | 62% | 2169 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 35,462 psi | 72% | 2211 fps | 96% |
| Lovex S070 | <<locked>> | 84% | 38,334 psi | 78% | 2290 fps | 95.7% |
| Lovex S071 | <<locked>> | 98% | 35,128 psi | 71% | 2270 fps | 95.6% |
| Norma MRP | <<locked>> | 94% | 38,986 psi | 79% | 2431 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 31,836 psi | 65% | 2205 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 84% | 35,317 psi | 72% | 2290 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,282 psi | 55% | 1407 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,655 psi | 84% | 2336 fps | 97% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,855 psi | 77% | 2385 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,299 psi | 63% | 2218 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 33,301 psi | 68% | 2274 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 38,319 psi | 78% | 2297 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 41,597 psi | 84% | 2326 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,462 psi | 72% | 2211 fps | 96% |
| Shooters World SW4350 | <<locked>> | 84% | 38,334 psi | 78% | 2290 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,305 psi | 80% | 2343 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,654 psi | 82% | 2234 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 36,970 psi | 75% | 2208 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 39,044 psi | 79% | 2300 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 28,732 psi | 58% | 2169 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 39,566 psi | 80% | 2349 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 37,101 psi | 75% | 2238 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 33,344 psi | 68% | 2208 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 98% | 41,423 psi | 84% | 2372 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 32,764 psi | 66% | 2208 fps | 96.1% |
| Vihtavuori N555 | 39.8 gr | 84% | 28,065 psi | 57% | 2159 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,779 psi | 66% | 2185 fps | 98.4% |
| Winchester 760 | <<locked>> | 84% | 38,711 psi | 79% | 2349 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,005 psi | 53% | 2159 fps | 95.6% |
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 48 powders for 7 x 57 R loaded with the .285 | 173gr | Prvi Partizan FMJ BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,579 fps; across all powders the maximum-charge window runs from 1,539 fps to 2,579 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 48 of the 48 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. The 173.0 gr projectile in 0.285" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, 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. Alliant Reloder-26, Alliant Reloder-16, Vihtavuori N555 rank at the top here: for 7 x 57 R with the .285 | 173gr | Prvi Partizan FMJ 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.