Load Specifications
Load data in caliber 7 x 57 R with .284 | 174gr | Prvi Partizan PSP 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, ReloadSwiss RS 70 and ReloadSwiss RS 62.
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% | 43,743 psi | 89% | 2418 fps | 97.8% |
| Accurate 4064 | <<locked>> | 82% | 44,512 psi | 90% | 2359 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 43,439 psi | 88% | 2425 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 82% | 42,873 psi | 87% | 2336 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 42,801 psi | 87% | 2356 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 42,525 psi | 86% | 2431 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 42,467 psi | 86% | 2451 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,669 psi | 85% | 2444 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 36,550 psi | 74% | 2352 fps | 96.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 43,352 psi | 88% | 2539 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 42,511 psi | 86% | 2362 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 43,352 psi | 88% | 2343 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 82% | 43,482 psi | 88% | 2372 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 88% | 42,960 psi | 87% | 2415 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 41,872 psi | 85% | 2372 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 42,612 psi | 86% | 2438 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,926 psi | 73% | 1522 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 43,555 psi | 88% | 2369 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,221 psi | 86% | 2323 fps | 96.3% |
| IMR 4831 | <<locked>> | 92% | 44,483 psi | 90% | 2425 fps | 99.3% |
| Lovex S065 | <<locked>> | 88% | 44,353 psi | 90% | 2365 fps | 98.2% |
| Lovex S070 | <<locked>> | 88% | 42,380 psi | 86% | 2352 fps | 96.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 36,289 psi | 74% | 2280 fps | 95.8% |
| Norma MRP | <<locked>> | 98% | 43,526 psi | 88% | 2503 fps | 96.7% |
| Norma URP | <<locked>> | 90% | 43,062 psi | 87% | 2415 fps | 99% |
| Ramshot Hunter | <<locked>> | 90% | 42,090 psi | 85% | 2411 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,463 psi | 74% | 1558 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,714 psi | 89% | 2356 fps | 97.4% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 42,221 psi | 86% | 2451 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 42,931 psi | 87% | 2441 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 42,699 psi | 87% | 2457 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 84% | 42,714 psi | 87% | 2359 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 43,352 psi | 88% | 2343 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 44,353 psi | 90% | 2365 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 88% | 42,380 psi | 86% | 2352 fps | 96.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 44,063 psi | 89% | 2411 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 42,264 psi | 86% | 2244 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,903 psi | 89% | 2320 fps | 96.8% |
| Somchem S355 | <<locked>> | 84% | 43,424 psi | 88% | 2362 fps | 99.8% |
| Somchem S365 | <<locked>> | 94% | 44,063 psi | 89% | 2467 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 43,816 psi | 89% | 2411 fps | 96.2% |
| Vihtavuori N150 | <<locked>> | 86% | 44,309 psi | 90% | 2349 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 42,119 psi | 85% | 2365 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 90% | 44,251 psi | 90% | 2418 fps | 99% |
| Vihtavuori N555 | <<locked>> | 98% | 43,236 psi | 88% | 2464 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 41,843 psi | 85% | 2346 fps | 99.8% |
| Winchester 760 | <<locked>> | 88% | 43,236 psi | 88% | 2421 fps | 96.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,144 psi | 75% | 2464 fps | 99.9% |
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>> | 94% | 35,781 psi | 73% | 2270 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 41,901 psi | 85% | 2320 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,893 psi | 63% | 2175 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 40,350 psi | 82% | 2290 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,248 psi | 82% | 2313 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,198 psi | 63% | 2185 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,621 psi | 70% | 2293 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,079 psi | 55% | 2110 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 98% | 34,476 psi | 70% | 2303 fps | 95.4% |
| Alliant Reloder-26 | 45.6 gr | 90% | 32,996 psi | 67% | 2316 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 39,958 psi | 81% | 2316 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 40,553 psi | 82% | 2290 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 40,640 psi | 82% | 2320 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 84% | 37,753 psi | 77% | 2316 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,747 psi | 58% | 2100 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 86% | 39,610 psi | 80% | 2375 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,745 psi | 54% | 1358 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 40,756 psi | 83% | 2320 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,798 psi | 81% | 2277 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 29,936 psi | 61% | 2136 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 34,940 psi | 71% | 2188 fps | 95.7% |
| Lovex S070 | <<locked>> | 84% | 37,347 psi | 76% | 2254 fps | 95.2% |
| Lovex S071 | <<locked>> | 98% | 34,272 psi | 70% | 2241 fps | 95.1% |
| Norma MRP | <<locked>> | 96% | 40,683 psi | 83% | 2451 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 31,285 psi | 63% | 2178 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 84% | 34,708 psi | 70% | 2260 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,021 psi | 55% | 1388 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,930 psi | 83% | 2306 fps | 96.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,840 psi | 75% | 2349 fps | 100% |
| ReloadSwiss RS 62 | 39.5 gr | 80% | 30,589 psi | 62% | 2188 fps | 95.2% |
| ReloadSwiss RS 70 | 41.1 gr | 82% | 32,532 psi | 66% | 2238 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 37,666 psi | 76% | 2270 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 40,553 psi | 82% | 2290 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,940 psi | 71% | 2188 fps | 95.7% |
| Shooters World SW4350 | <<locked>> | 84% | 37,347 psi | 76% | 2254 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,464 psi | 78% | 2313 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,726 psi | 81% | 2205 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,783 psi | 79% | 2231 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 38,406 psi | 78% | 2274 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 28,036 psi | 57% | 2136 fps | 98% |
| Somchem S385 | <<locked>> | 94% | 41,205 psi | 84% | 2365 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 36,535 psi | 74% | 2215 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 32,576 psi | 66% | 2178 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 80% | 32,024 psi | 65% | 2178 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 86% | 29,138 psi | 59% | 2175 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,053 psi | 65% | 2152 fps | 98.1% |
| Winchester 760 | <<locked>> | 84% | 37,753 psi | 77% | 2316 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,122 psi | 55% | 2182 fps | 96.3% |
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 .284 | 174gr | Prvi Partizan PSP BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,539 fps; across all powders the maximum-charge window runs from 1,522 fps to 2,539 fps. Accurate 3100 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 174.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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, ReloadSwiss RS 62 rank at the top here: for 7 x 57 R with the .284 | 174gr | 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.