Load Specifications
Load data in caliber 7 x 57 R with .284 | 174gr | Prvi Partizan SP bullet and 49 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 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% | 41,756 psi | 85% | 2388 fps | 97.5% |
| Accurate 4350 | <<locked>> | 90% | 44,309 psi | 90% | 2444 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 82% | 43,439 psi | 88% | 2349 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 43,381 psi | 88% | 2372 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 43,250 psi | 88% | 2451 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 43,221 psi | 88% | 2470 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,279 psi | 86% | 2461 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,260 psi | 76% | 2375 fps | 96.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 44,208 psi | 90% | 2562 fps | 99.3% |
| Bofors RP3 | <<locked>> | 82% | 43,424 psi | 88% | 2382 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 43,816 psi | 89% | 2356 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 82% | 44,034 psi | 89% | 2388 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 88% | 43,729 psi | 89% | 2434 fps | 97.1% |
| Hodgdon H4350 | <<locked>> | 86% | 44,527 psi | 90% | 2405 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 42,685 psi | 87% | 2392 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 43,236 psi | 88% | 2454 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,810 psi | 73% | 1529 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 44,266 psi | 90% | 2388 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,714 psi | 87% | 2339 fps | 96.5% |
| IMR 4831 | <<locked>> | 90% | 42,322 psi | 86% | 2395 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 42,569 psi | 86% | 2343 fps | 97.9% |
| Lovex S070 | <<locked>> | 88% | 43,105 psi | 87% | 2372 fps | 97% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,260 psi | 76% | 2306 fps | 96.3% |
| Norma MRP | <<locked>> | 98% | 44,396 psi | 90% | 2526 fps | 97.1% |
| Norma URP | <<locked>> | 90% | 43,888 psi | 89% | 2434 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 90% | 42,743 psi | 87% | 2428 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,332 psi | 74% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 44,208 psi | 90% | 2372 fps | 97.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 42,989 psi | 87% | 2470 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 44,034 psi | 89% | 2464 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 43,337 psi | 88% | 2477 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 84% | 43,598 psi | 88% | 2379 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 43,816 psi | 89% | 2356 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 42,569 psi | 86% | 2343 fps | 97.9% |
| Shooters World SW4350 | <<locked>> | 88% | 43,105 psi | 87% | 2372 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 41,713 psi | 85% | 2379 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 42,917 psi | 87% | 2260 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,585 psi | 90% | 2336 fps | 97.1% |
| Somchem S355 | <<locked>> | 84% | 43,961 psi | 89% | 2375 fps | 99.9% |
| Somchem S365 | <<locked>> | 92% | 42,148 psi | 85% | 2441 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 41,901 psi | 85% | 2382 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 84% | 42,177 psi | 86% | 2320 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 42,873 psi | 87% | 2382 fps | 98.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 43,888 psi | 89% | 2405 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 88% | 42,424 psi | 86% | 2392 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 98% | 44,034 psi | 89% | 2484 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 42,409 psi | 86% | 2362 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 44,005 psi | 89% | 2441 fps | 97.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,869 psi | 77% | 2487 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% | 34,243 psi | 69% | 2244 fps | 95.2% |
| Accurate 4350 | <<locked>> | 80% | 31,444 psi | 64% | 2192 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 80% | 40,901 psi | 83% | 2306 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,857 psi | 83% | 2329 fps | 99.8% |
| Alliant Reloder-16 | 37.3 gr | 80% | 31,676 psi | 64% | 2201 fps | 96.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,331 psi | 72% | 2316 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 84% | 25,889 psi | 53% | 2077 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,172 psi | 71% | 2326 fps | 95.9% |
| Alliant Reloder-26 | 45.3 gr | 88% | 31,386 psi | 64% | 2280 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 40,567 psi | 82% | 2333 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 41,321 psi | 84% | 2313 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 41,162 psi | 83% | 2336 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 38,508 psi | 78% | 2336 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 84% | 41,974 psi | 85% | 2359 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,225 psi | 59% | 2116 fps | 97.1% |
| Hodgdon Superformance | <<locked>> | 86% | 40,451 psi | 82% | 2402 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,774 psi | 54% | 1365 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 39,131 psi | 79% | 2293 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 37,753 psi | 77% | 2241 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 30,676 psi | 62% | 2159 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 35,433 psi | 72% | 2201 fps | 96% |
| Lovex S070 | <<locked>> | 84% | 38,101 psi | 77% | 2277 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 34,983 psi | 71% | 2260 fps | 95.5% |
| Norma MRP | <<locked>> | 94% | 38,856 psi | 79% | 2418 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 31,821 psi | 65% | 2195 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 84% | 35,172 psi | 71% | 2277 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,325 psi | 55% | 1401 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,437 psi | 84% | 2323 fps | 97% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,594 psi | 76% | 2372 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,082 psi | 63% | 2205 fps | 95.5% |
| ReloadSwiss RS 70 | 41.8 gr | 82% | 33,127 psi | 67% | 2257 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 38,290 psi | 78% | 2287 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 41,321 psi | 84% | 2313 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,433 psi | 72% | 2201 fps | 96% |
| Shooters World SW4350 | <<locked>> | 84% | 38,101 psi | 77% | 2277 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,276 psi | 80% | 2333 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,321 psi | 82% | 2218 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 39,291 psi | 80% | 2244 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 39,030 psi | 79% | 2290 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 28,514 psi | 58% | 2156 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 39,175 psi | 79% | 2333 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 37,086 psi | 75% | 2231 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 33,112 psi | 67% | 2195 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 98% | 41,046 psi | 83% | 2356 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 32,532 psi | 66% | 2195 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 27,862 psi | 56% | 2146 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,634 psi | 66% | 2172 fps | 98.4% |
| Winchester 760 | <<locked>> | 84% | 38,508 psi | 78% | 2336 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,904 psi | 53% | 2149 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 49 powders for 7 x 57 R loaded with the .284 | 174gr | Prvi Partizan SP. Alliant Reloder-26 delivers the highest muzzle velocity at 2,562 fps; across all powders the maximum-charge window runs from 1,529 fps to 2,562 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 49 of the 49 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 1:11.5 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, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for 7 x 57 R with the .284 | 174gr | 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.