Load Specifications
Load data in caliber 7 x 57 R with .285 | 173gr | Prvi Partizan SP bullet and 45 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Somchem S365.
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% | 42,801 psi | 87% | 2421 fps | 97.8% |
| Accurate 4350 | <<locked>> | 88% | 42,279 psi | 86% | 2421 fps | 99% |
| ADI AR 2208 | <<locked>> | 82% | 44,222 psi | 90% | 2379 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 44,208 psi | 90% | 2398 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 43,888 psi | 89% | 2477 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 86% | 44,077 psi | 89% | 2500 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,265 psi | 88% | 2490 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,072 psi | 77% | 2408 fps | 97.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 42,148 psi | 85% | 2539 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 44,222 psi | 90% | 2408 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 44,498 psi | 90% | 2382 fps | 96.6% |
| Hodgdon H414 | <<locked>> | 86% | 41,785 psi | 85% | 2415 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 43,627 psi | 88% | 2421 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 44,150 psi | 90% | 2487 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,984 psi | 73% | 1545 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 42,322 psi | 86% | 2369 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,366 psi | 88% | 2365 fps | 96.8% |
| IMR 4831 | <<locked>> | 90% | 43,279 psi | 88% | 2425 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 43,207 psi | 88% | 2365 fps | 98.1% |
| Lovex S070 | <<locked>> | 88% | 43,743 psi | 89% | 2395 fps | 97.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,087 psi | 77% | 2336 fps | 96.6% |
| Norma MRP | <<locked>> | 96% | 42,424 psi | 86% | 2503 fps | 96.7% |
| Norma URP | <<locked>> | 88% | 41,959 psi | 85% | 2415 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 90% | 43,555 psi | 88% | 2457 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,506 psi | 74% | 1581 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 43,642 psi | 89% | 2493 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 42,032 psi | 85% | 2444 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 44,324 psi | 90% | 2510 fps | 99% |
| Rottweil R 903 | <<locked>> | 84% | 44,440 psi | 90% | 2405 fps | 100% |
| Rottweil R 907 | <<locked>> | 86% | 44,498 psi | 90% | 2382 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 43,207 psi | 88% | 2365 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 88% | 43,743 psi | 89% | 2395 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 42,743 psi | 87% | 2408 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 43,714 psi | 89% | 2287 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,612 psi | 86% | 2320 fps | 96.8% |
| Somchem S355 | <<locked>> | 82% | 42,250 psi | 86% | 2362 fps | 99.8% |
| Somchem S365 | <<locked>> | 92% | 43,091 psi | 87% | 2470 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 42,656 psi | 87% | 2411 fps | 96.2% |
| Vihtavuori N150 | <<locked>> | 84% | 42,946 psi | 87% | 2346 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 43,859 psi | 89% | 2415 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 88% | 43,033 psi | 87% | 2415 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 96% | 42,308 psi | 86% | 2464 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 43,381 psi | 88% | 2395 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,105 psi | 85% | 2421 fps | 96.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,899 psi | 79% | 2526 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% | 35,041 psi | 71% | 2274 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 32,227 psi | 65% | 2221 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 80% | 41,423 psi | 84% | 2329 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,394 psi | 84% | 2352 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,329 psi | 66% | 2234 fps | 96.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,984 psi | 73% | 2343 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 26,397 psi | 54% | 2106 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 96% | 33,794 psi | 69% | 2306 fps | 95.4% |
| Alliant Reloder-26 | 46.3 gr | 88% | 31,995 psi | 65% | 2310 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 41,365 psi | 84% | 2362 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 39,363 psi | 80% | 2290 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 82% | 36,651 psi | 74% | 2313 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,718 psi | 60% | 2142 fps | 97.4% |
| Hodgdon Superformance | <<locked>> | 86% | 41,147 psi | 83% | 2431 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,861 psi | 54% | 1378 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 39,711 psi | 81% | 2320 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,421 psi | 78% | 2270 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 31,169 psi | 63% | 2182 fps | 96.2% |
| Lovex S065 | <<locked>> | 80% | 35,911 psi | 73% | 2228 fps | 96.2% |
| Lovex S070 | <<locked>> | 82% | 36,318 psi | 74% | 2254 fps | 95.1% |
| Lovex S071 | <<locked>> | 96% | 33,649 psi | 68% | 2244 fps | 95.1% |
| Norma MRP | 48 gr | 94% | 39,508 psi | 80% | 2444 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 32,518 psi | 66% | 2221 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 84% | 35,911 psi | 73% | 2306 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,398 psi | 56% | 1414 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,261 psi | 78% | 2398 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,923 psi | 65% | 2238 fps | 96% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 33,837 psi | 69% | 2290 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 39,131 psi | 79% | 2313 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 82% | 39,363 psi | 80% | 2290 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,911 psi | 73% | 2228 fps | 96.2% |
| Shooters World SW4350 | <<locked>> | 82% | 36,318 psi | 74% | 2254 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,016 psi | 81% | 2362 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,872 psi | 83% | 2241 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 37,376 psi | 76% | 2221 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 39,552 psi | 80% | 2313 fps | 99.6% |
| Somchem S365 | 39 gr | 80% | 29,153 psi | 59% | 2182 fps | 98.5% |
| Somchem S385 | <<locked>> | 92% | 39,943 psi | 81% | 2362 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 37,826 psi | 77% | 2257 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 33,779 psi | 69% | 2221 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 80% | 33,185 psi | 67% | 2221 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 84% | 28,500 psi | 58% | 2172 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,301 psi | 68% | 2201 fps | 98.6% |
| Winchester 760 | <<locked>> | 82% | 36,651 psi | 74% | 2313 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,426 psi | 54% | 2182 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 45 powders for 7 x 57 R loaded with the .285 | 173gr | Prvi Partizan SP. Alliant Reloder-26 delivers the highest muzzle velocity at 2,539 fps; across all powders the maximum-charge window runs from 1,545 fps to 2,539 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 45 of the 45 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 1:12.5 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, Norma MRP, Somchem S365 rank at the top here: for 7 x 57 R with the .285 | 173gr | 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.