Load Specifications
Load data in caliber 7 x 57 R with .284 | 160gr | Speer Hot-Cor 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, Alliant Reloder-16 and Somchem S365.
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% | 41,655 psi | 84% | 2487 fps | 96.6% |
| Accurate 4064 | <<locked>> | 82% | 42,714 psi | 87% | 2444 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 44,280 psi | 90% | 2549 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 84% | 43,918 psi | 89% | 2461 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 43,903 psi | 89% | 2487 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 82% | 44,266 psi | 90% | 2500 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 92% | 43,598 psi | 88% | 2559 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 88% | 43,613 psi | 88% | 2585 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,958 psi | 81% | 2516 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 41,437 psi | 84% | 2608 fps | 97.9% |
| Bofors RP3 | <<locked>> | 84% | 43,801 psi | 89% | 2497 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 84% | 44,498 psi | 90% | 2500 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 90% | 44,121 psi | 89% | 2546 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,830 psi | 87% | 2500 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,694 psi | 72% | 1598 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 43,482 psi | 88% | 2448 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,323 psi | 88% | 2448 fps | 95.7% |
| IMR 4831 | <<locked>> | 92% | 42,395 psi | 86% | 2500 fps | 98.4% |
| Lovex S062 | <<locked>> | 82% | 43,511 psi | 88% | 2451 fps | 99.9% |
| Lovex S065 | <<locked>> | 88% | 43,018 psi | 87% | 2451 fps | 97.2% |
| Lovex S070 | <<locked>> | 90% | 43,453 psi | 88% | 2477 fps | 96.2% |
| Norma 203B | <<locked>> | 82% | 43,584 psi | 88% | 2490 fps | 99.4% |
| Norma MRPᴾ | <<locked>> | 100% | 44,396 psi | 90% | 2625 fps | 96% |
| Norma URP | <<locked>> | 92% | 44,034 psi | 89% | 2543 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 82% | 43,323 psi | 88% | 2507 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 92% | 43,062 psi | 87% | 2536 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 73% | 1637 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,192 psi | 86% | 2434 fps | 96.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 43,511 psi | 88% | 2589 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 44,077 psi | 89% | 2572 fps | 98.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 43,642 psi | 89% | 2582 fps | 98% |
| Rottweil R 903 | <<locked>> | 86% | 44,005 psi | 89% | 2493 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 43,018 psi | 87% | 2451 fps | 97.2% |
| Shooters World Precision | <<locked>> | 82% | 43,511 psi | 88% | 2451 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 90% | 43,453 psi | 88% | 2477 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 42,308 psi | 86% | 2493 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 43,497 psi | 88% | 2375 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 44,498 psi | 90% | 2490 fps | 99.7% |
| Somchem S365 | <<locked>> | 94% | 42,322 psi | 86% | 2552 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 42,699 psi | 87% | 2431 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 43,395 psi | 88% | 2497 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 82% | 43,816 psi | 89% | 2441 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 42,511 psi | 86% | 2497 fps | 98.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,932 psi | 89% | 2589 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 43,134 psi | 87% | 2474 fps | 99.7% |
| Winchester 760 | <<locked>> | 90% | 44,121 psi | 89% | 2546 fps | 96.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,636 psi | 72% | 2523 fps | 99.2% |
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>> | 98% | 38,841 psi | 79% | 2434 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 40,219 psi | 82% | 2402 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,546 psi | 64% | 2290 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 39,030 psi | 79% | 2369 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,754 psi | 79% | 2392 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,466 psi | 84% | 2448 fps | 98.7% |
| Alliant Reloder-16 | 38.8 gr | 82% | 31,908 psi | 65% | 2300 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,344 psi | 68% | 2365 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,385 psi | 60% | 2264 fps | 95.8% |
| Alliant Reloder-26 | 48.1 gr | 92% | 33,765 psi | 68% | 2431 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 38,290 psi | 78% | 2392 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 80% | 38,972 psi | 79% | 2395 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 41,307 psi | 84% | 2490 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,485 psi | 56% | 2159 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,542 psi | 54% | 1427 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,002 psi | 83% | 2402 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,930 psi | 83% | 2402 fps | 95% |
| IMR 4831 | <<locked>> | 84% | 32,793 psi | 67% | 2303 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 40,727 psi | 83% | 2398 fps | 99.6% |
| Lovex S065 | <<locked>> | 82% | 35,723 psi | 72% | 2303 fps | 95% |
| Lovex S070 | <<locked>> | 88% | 40,741 psi | 83% | 2425 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 40,828 psi | 83% | 2438 fps | 99% |
| Norma MRP | <<locked>> | 98% | 41,597 psi | 84% | 2569 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 31,850 psi | 65% | 2290 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 40,292 psi | 82% | 2451 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 37,884 psi | 77% | 2431 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,035 psi | 55% | 1463 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,581 psi | 80% | 2382 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,462 psi | 72% | 2425 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,460 psi | 68% | 2356 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,737 psi | 72% | 2411 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 36,172 psi | 73% | 2346 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,723 psi | 72% | 2303 fps | 95% |
| Shooters World Precision | <<locked>> | 80% | 40,727 psi | 83% | 2398 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 40,741 psi | 83% | 2425 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,057 psi | 75% | 2392 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,522 psi | 78% | 2290 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 36,999 psi | 75% | 2349 fps | 98.6% |
| Somchem S365 | 38.7 gr | 80% | 26,876 psi | 55% | 2195 fps | 96.5% |
| Vihtavuori N150 | <<locked>> | 80% | 35,128 psi | 71% | 2290 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 33,388 psi | 68% | 2293 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 41,046 psi | 83% | 2395 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,706 psi | 66% | 2293 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 29,530 psi | 60% | 2283 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,096 psi | 63% | 2224 fps | 97% |
| Winchester 760 | <<locked>> | 88% | 41,307 psi | 84% | 2490 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,659 psi | 56% | 2280 fps | 95.1% |
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 | 160gr | Speer Hot-Cor. Norma MRP delivers the highest muzzle velocity at 2,625 fps; across all powders the maximum-charge window runs from 1,598 fps to 2,625 fps. Accurate 3100 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 72–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:12.0 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, Alliant Reloder-16, Somchem S365 rank at the top here: for 7 x 57 R with the .284 | 160gr | Speer Hot-Cor 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.