Load Specifications
Load data in caliber 7 x 57 R with .284 | 175gr | Speer Grand Slam 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, 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% | 42,177 psi | 86% | 2388 fps | 97.7% |
| Accurate 4350 | <<locked>> | 88% | 41,756 psi | 85% | 2395 fps | 99% |
| ADI AR 2208 | <<locked>> | 82% | 43,874 psi | 89% | 2352 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 43,859 psi | 89% | 2372 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 43,700 psi | 89% | 2454 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 86% | 43,656 psi | 89% | 2474 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,960 psi | 87% | 2467 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,623 psi | 76% | 2379 fps | 97% |
| Alliant Reloder-26 | <<locked>> | 96% | 41,727 psi | 85% | 2510 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 43,918 psi | 89% | 2385 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 44,251 psi | 90% | 2359 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 82% | 44,498 psi | 90% | 2388 fps | 99% |
| Hodgdon H414 | <<locked>> | 88% | 44,193 psi | 90% | 2441 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 43,149 psi | 88% | 2395 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 43,598 psi | 88% | 2457 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,926 psi | 73% | 1529 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 41,901 psi | 85% | 2343 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,091 psi | 87% | 2343 fps | 96.7% |
| IMR 4831 | <<locked>> | 90% | 42,786 psi | 87% | 2398 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 42,975 psi | 87% | 2346 fps | 98.1% |
| Lovex S070 | <<locked>> | 88% | 43,540 psi | 88% | 2375 fps | 97.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,710 psi | 76% | 2310 fps | 96.5% |
| Norma MRP | <<locked>> | 96% | 41,930 psi | 85% | 2477 fps | 96.5% |
| Norma URP | <<locked>> | 90% | 44,367 psi | 90% | 2438 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 90% | 43,178 psi | 88% | 2431 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,463 psi | 74% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 44,614 psi | 90% | 2375 fps | 97.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 43,453 psi | 88% | 2470 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 44,512 psi | 90% | 2467 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 43,714 psi | 89% | 2480 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 84% | 44,106 psi | 89% | 2382 fps | 100% |
| Rottweil R 905 | <<locked>> | 96% | 44,382 psi | 90% | 2448 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 86% | 44,251 psi | 90% | 2359 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 42,975 psi | 87% | 2346 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 88% | 43,540 psi | 88% | 2375 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 42,177 psi | 86% | 2382 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 43,308 psi | 88% | 2260 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,424 psi | 86% | 2297 fps | 96.7% |
| Somchem S355 | <<locked>> | 84% | 44,454 psi | 90% | 2379 fps | 99.9% |
| Somchem S365 | <<locked>> | 92% | 42,627 psi | 86% | 2444 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 42,308 psi | 86% | 2385 fps | 96.1% |
| Vihtavuori N150 | <<locked>> | 84% | 42,641 psi | 86% | 2320 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 43,337 psi | 88% | 2385 fps | 99.1% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 44,324 psi | 90% | 2408 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 88% | 42,859 psi | 87% | 2395 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 98% | 44,599 psi | 90% | 2484 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 43,076 psi | 87% | 2369 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 44,454 psi | 90% | 2444 fps | 97.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,479 psi | 78% | 2497 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% | 34,650 psi | 70% | 2247 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 31,879 psi | 65% | 2198 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 80% | 41,336 psi | 84% | 2310 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,321 psi | 84% | 2329 fps | 99.9% |
| Alliant Reloder-16 | 37.5 gr | 80% | 32,010 psi | 65% | 2208 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,737 psi | 72% | 2320 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 26,179 psi | 53% | 2083 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 96% | 33,315 psi | 68% | 2277 fps | 95.1% |
| Alliant Reloder-26 | 45.5 gr | 88% | 31,705 psi | 64% | 2287 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 41,017 psi | 83% | 2336 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 39,073 psi | 79% | 2264 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 41,611 psi | 84% | 2339 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 84% | 38,914 psi | 79% | 2339 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,399 psi | 60% | 2116 fps | 97.3% |
| Hodgdon Superformance | <<locked>> | 86% | 40,872 psi | 83% | 2405 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,919 psi | 55% | 1365 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 39,247 psi | 80% | 2293 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,116 psi | 77% | 2247 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 30,864 psi | 63% | 2159 fps | 96.1% |
| Lovex S065 | <<locked>> | 80% | 35,592 psi | 72% | 2201 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 36,042 psi | 73% | 2231 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 33,228 psi | 67% | 2218 fps | 95% |
| Norma MRP | 47.2 gr | 94% | 39,247 psi | 80% | 2421 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 32,184 psi | 65% | 2198 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 84% | 35,505 psi | 72% | 2280 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,209 psi | 55% | 1394 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,814 psi | 85% | 2326 fps | 97.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,014 psi | 77% | 2372 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,459 psi | 64% | 2208 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 33,460 psi | 68% | 2264 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 38,740 psi | 79% | 2287 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 94% | 41,727 psi | 85% | 2402 fps | 95% |
| Rottweil R 907 | <<locked>> | 82% | 39,073 psi | 79% | 2264 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,592 psi | 72% | 2201 fps | 96.1% |
| Shooters World SW4350 | <<locked>> | 82% | 36,042 psi | 73% | 2231 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,465 psi | 80% | 2333 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,756 psi | 83% | 2221 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 37,101 psi | 75% | 2198 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 39,175 psi | 79% | 2287 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 28,863 psi | 59% | 2159 fps | 98.5% |
| Somchem S385 | <<locked>> | 92% | 39,581 psi | 80% | 2336 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 37,521 psi | 76% | 2231 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 33,489 psi | 68% | 2198 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 98% | 41,437 psi | 84% | 2359 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 32,895 psi | 67% | 2198 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 28,224 psi | 57% | 2149 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,924 psi | 67% | 2175 fps | 98.6% |
| Winchester 760 | <<locked>> | 84% | 38,914 psi | 79% | 2339 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,165 psi | 53% | 2156 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 49 powders for 7 x 57 R loaded with the .284 | 175gr | Speer Grand Slam. Alliant Reloder-26 delivers the highest muzzle velocity at 2,510 fps; across all powders the maximum-charge window runs from 1,529 fps to 2,510 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 175.0 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 | 175gr | Speer Grand Slam 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.