Load Specifications
Load data in caliber 7 x 57 R with .284 | 160gr | Speer Grand Slam bullet and 44 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Somchem S365 and ReloadSwiss RS 70.
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% | 42,888 psi | 87% | 2516 fps | 97% |
| Accurate 4064 | <<locked>> | 82% | 43,714 psi | 89% | 2467 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 42,395 psi | 86% | 2523 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 82% | 42,235 psi | 86% | 2438 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 41,974 psi | 85% | 2461 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 92% | 44,309 psi | 90% | 2579 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 44,614 psi | 90% | 2608 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,814 psi | 83% | 2539 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 42,453 psi | 86% | 2635 fps | 98.3% |
| Bofors RP3 | <<locked>> | 82% | 41,829 psi | 85% | 2467 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 82% | 42,482 psi | 86% | 2470 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 43,888 psi | 89% | 2523 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,708 psi | 72% | 1608 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 44,396 psi | 90% | 2470 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,077 psi | 89% | 2467 fps | 96.1% |
| IMR 4831 | <<locked>> | 92% | 43,424 psi | 88% | 2526 fps | 98.7% |
| Lovex S062 | <<locked>> | 82% | 44,106 psi | 89% | 2467 fps | 99.9% |
| Lovex S065 | <<locked>> | 88% | 43,787 psi | 89% | 2470 fps | 97.5% |
| Lovex S070 | <<locked>> | 90% | 44,179 psi | 90% | 2497 fps | 96.5% |
| Norma 203B | <<locked>> | 82% | 44,498 psi | 90% | 2510 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 42,192 psi | 86% | 2516 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 82% | 44,106 psi | 89% | 2526 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 92% | 43,961 psi | 89% | 2559 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,172 psi | 73% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,946 psi | 87% | 2454 fps | 96.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 44,251 psi | 90% | 2608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 42,221 psi | 86% | 2543 fps | 98.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 41,727 psi | 85% | 2552 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 84% | 42,032 psi | 85% | 2464 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 43,787 psi | 89% | 2470 fps | 97.5% |
| Shooters World Precision | <<locked>> | 82% | 44,106 psi | 89% | 2467 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 90% | 44,179 psi | 90% | 2497 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 43,105 psi | 87% | 2513 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 44,382 psi | 90% | 2395 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,192 psi | 88% | 2418 fps | 96% |
| Somchem S355 | <<locked>> | 84% | 42,525 psi | 86% | 2464 fps | 99.5% |
| Somchem S365 | <<locked>> | 94% | 43,076 psi | 87% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 43,482 psi | 88% | 2451 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 44,164 psi | 90% | 2516 fps | 98.6% |
| Vihtavuori N550 | <<locked>> | 90% | 43,497 psi | 88% | 2520 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 98% | 42,047 psi | 85% | 2559 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 43,903 psi | 89% | 2493 fps | 99.8% |
| Winchester 760 | <<locked>> | 88% | 42,293 psi | 86% | 2516 fps | 95.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,535 psi | 74% | 2556 fps | 99.6% |
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>> | 96% | 37,376 psi | 76% | 2411 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 40,959 psi | 83% | 2421 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,401 psi | 66% | 2316 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 39,624 psi | 80% | 2388 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,363 psi | 80% | 2411 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,590 psi | 66% | 2323 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,026 psi | 69% | 2388 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,311 psi | 57% | 2238 fps | 95.4% |
| Alliant Reloder-26 | 49 gr | 92% | 34,476 psi | 70% | 2457 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 39,160 psi | 79% | 2418 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 80% | 39,827 psi | 81% | 2418 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,166 psi | 57% | 2182 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,731 psi | 54% | 1437 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,611 psi | 84% | 2418 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,408 psi | 84% | 2418 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 31,386 psi | 64% | 2274 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 41,640 psi | 84% | 2425 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 36,448 psi | 74% | 2326 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 39,160 psi | 79% | 2402 fps | 95% |
| Norma 203B | <<locked>> | 80% | 41,727 psi | 85% | 2461 fps | 99.2% |
| Norma URP | <<locked>> | 82% | 32,605 psi | 66% | 2313 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 41,089 psi | 83% | 2470 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 38,783 psi | 79% | 2457 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,963 psi | 55% | 1467 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,335 psi | 82% | 2405 fps | 95.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,187 psi | 73% | 2448 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,010 psi | 65% | 2326 fps | 95% |
| ReloadSwiss RS 70 | 45.4 gr | 86% | 36,535 psi | 74% | 2438 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 36,782 psi | 75% | 2362 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,448 psi | 74% | 2326 fps | 95.4% |
| Shooters World Precision | <<locked>> | 80% | 41,640 psi | 84% | 2425 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 39,160 psi | 79% | 2402 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,840 psi | 77% | 2411 fps | 98.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,146 psi | 79% | 2306 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 40,451 psi | 82% | 2369 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 37,608 psi | 76% | 2369 fps | 98.8% |
| Somchem S365 | 39.4 gr | 80% | 27,340 psi | 55% | 2215 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 35,708 psi | 72% | 2306 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 31,966 psi | 65% | 2267 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 82% | 33,417 psi | 68% | 2316 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 88% | 30,458 psi | 62% | 2310 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,647 psi | 64% | 2244 fps | 97.3% |
| Winchester 760 | <<locked>> | 86% | 39,639 psi | 80% | 2467 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,297 psi | 57% | 2313 fps | 95.9% |
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 44 powders for 7 x 57 R loaded with the .284 | 160gr | Speer Grand Slam. Alliant Reloder-26 delivers the highest muzzle velocity at 2,635 fps; across all powders the maximum-charge window runs from 1,608 fps to 2,635 fps. Accurate 3100 gives the best case fill at 100 %, and 44 of the 44 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, 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, Somchem S365, ReloadSwiss RS 70 rank at the top here: for 7 x 57 R with the .284 | 160gr | 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.