Load Specifications
Load data in caliber 7 x 57 R with .284 | 174gr | Prvi Partizan FMJ BT bullet and 47 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 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 3100 | <<locked>> | 98% | 42,308 psi | 86% | 2402 fps | 97.7% |
| Accurate 4350 | <<locked>> | 88% | 41,989 psi | 85% | 2405 fps | 99% |
| ADI AR 2208 | <<locked>> | 82% | 43,845 psi | 89% | 2359 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 43,801 psi | 89% | 2382 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 43,598 psi | 88% | 2461 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 86% | 43,569 psi | 88% | 2480 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,844 psi | 87% | 2474 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,695 psi | 76% | 2388 fps | 97% |
| Alliant Reloder-26 | <<locked>> | 96% | 41,785 psi | 85% | 2523 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 43,888 psi | 89% | 2392 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 44,193 psi | 90% | 2369 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 82% | 44,411 psi | 90% | 2398 fps | 99% |
| Hodgdon H414 | <<locked>> | 88% | 44,367 psi | 90% | 2451 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 43,352 psi | 88% | 2405 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 43,743 psi | 89% | 2467 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,955 psi | 73% | 1535 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 44,599 psi | 90% | 2398 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,323 psi | 88% | 2352 fps | 96.8% |
| IMR 4831 | <<locked>> | 90% | 42,975 psi | 87% | 2408 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 42,888 psi | 87% | 2352 fps | 98% |
| Lovex S070 | <<locked>> | 88% | 43,482 psi | 88% | 2382 fps | 97.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,840 psi | 77% | 2320 fps | 96.5% |
| Norma MRP | <<locked>> | 96% | 42,076 psi | 85% | 2487 fps | 96.5% |
| Norma URP | <<locked>> | 90% | 44,556 psi | 90% | 2448 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 90% | 43,323 psi | 88% | 2441 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,477 psi | 74% | 1572 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 43,381 psi | 88% | 2480 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 44,396 psi | 90% | 2474 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 43,845 psi | 89% | 2490 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 84% | 44,048 psi | 89% | 2388 fps | 100% |
| Rottweil R 907 | <<locked>> | 86% | 44,193 psi | 90% | 2369 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 42,888 psi | 87% | 2352 fps | 98% |
| Shooters World SW4350 | <<locked>> | 88% | 43,482 psi | 88% | 2382 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 42,409 psi | 86% | 2392 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 43,308 psi | 88% | 2270 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,351 psi | 86% | 2303 fps | 96.7% |
| Somchem S355 | <<locked>> | 82% | 41,858 psi | 85% | 2343 fps | 99.8% |
| Somchem S365 | <<locked>> | 92% | 42,815 psi | 87% | 2454 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 42,467 psi | 86% | 2398 fps | 96.1% |
| Vihtavuori N150 | <<locked>> | 84% | 42,598 psi | 86% | 2329 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 43,540 psi | 88% | 2398 fps | 99.1% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 44,411 psi | 90% | 2418 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 88% | 42,772 psi | 87% | 2402 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 96% | 41,771 psi | 85% | 2448 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 42,931 psi | 87% | 2375 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 44,367 psi | 90% | 2451 fps | 97.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,580 psi | 78% | 2507 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% | 34,548 psi | 70% | 2254 fps | 95.4% |
| Accurate 4350 | <<locked>> | 80% | 31,836 psi | 65% | 2205 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 80% | 41,321 psi | 84% | 2316 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,278 psi | 84% | 2339 fps | 99.9% |
| Alliant Reloder-16 | 37.7 gr | 80% | 32,010 psi | 65% | 2215 fps | 96.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,679 psi | 72% | 2326 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 84% | 26,339 psi | 53% | 2096 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 96% | 33,446 psi | 68% | 2287 fps | 95.1% |
| Alliant Reloder-26 | 45.8 gr | 88% | 31,850 psi | 65% | 2297 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 40,988 psi | 83% | 2343 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 39,059 psi | 79% | 2274 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 41,597 psi | 84% | 2349 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 84% | 38,870 psi | 79% | 2349 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,414 psi | 60% | 2123 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 86% | 40,727 psi | 83% | 2411 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,716 psi | 54% | 1365 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 39,436 psi | 80% | 2303 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,087 psi | 77% | 2254 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 31,053 psi | 63% | 2169 fps | 96.1% |
| Lovex S065 | <<locked>> | 80% | 35,810 psi | 73% | 2215 fps | 96.2% |
| Lovex S070 | <<locked>> | 82% | 36,013 psi | 73% | 2238 fps | 95% |
| Lovex S071 | <<locked>> | 98% | 35,317 psi | 72% | 2270 fps | 95.7% |
| Norma MRP | 47.5 gr | 94% | 39,378 psi | 80% | 2434 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 32,155 psi | 65% | 2205 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 84% | 35,679 psi | 72% | 2290 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,267 psi | 55% | 1401 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,942 psi | 77% | 2379 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,633 psi | 64% | 2221 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 33,634 psi | 68% | 2277 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 38,725 psi | 79% | 2297 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 82% | 39,059 psi | 79% | 2274 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,810 psi | 73% | 2215 fps | 96.2% |
| Shooters World SW4350 | <<locked>> | 82% | 36,013 psi | 73% | 2238 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,711 psi | 81% | 2346 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,741 psi | 83% | 2228 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 37,318 psi | 76% | 2211 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 39,465 psi | 80% | 2300 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 28,848 psi | 59% | 2165 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 39,711 psi | 81% | 2346 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 37,492 psi | 76% | 2241 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 33,475 psi | 68% | 2205 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 98% | 41,568 psi | 84% | 2369 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 32,866 psi | 67% | 2205 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 28,210 psi | 57% | 2159 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,098 psi | 67% | 2185 fps | 98.6% |
| Winchester 760 | <<locked>> | 82% | 36,593 psi | 74% | 2300 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,281 psi | 53% | 2165 fps | 96% |
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 | 174gr | Prvi Partizan FMJ BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,523 fps; across all powders the maximum-charge window runs from 1,535 fps to 2,523 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 73–90 %, leaving at least 10 % headroom. The 174.0 gr projectile in 0.284" 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, Norma MRP, Alliant Reloder-16 rank at the top here: for 7 x 57 R with the .284 | 174gr | 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.