Load Specifications
Load data in caliber 7 x 57 R with .284 | 158gr | Sellier & Bellot HPC bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, ReloadSwiss RS 70 and Alliant Reloder-17.
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 2495 | <<locked>> | 82% | 42,670 psi | 87% | 2415 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 43,178 psi | 88% | 2461 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 44,614 psi | 90% | 2559 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 84% | 42,134 psi | 85% | 2431 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,395 psi | 86% | 2556 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 44,396 psi | 90% | 2500 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,061 psi | 85% | 2461 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 94% | 43,787 psi | 89% | 2562 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 90% | 44,092 psi | 89% | 2595 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,666 psi | 76% | 2470 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,771 psi | 85% | 2612 fps | 97.5% |
| Bofors RP3 | <<locked>> | 86% | 44,266 psi | 90% | 2507 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 84% | 42,453 psi | 86% | 2464 fps | 97.5% |
| Hodgdon H414 | <<locked>> | 92% | 44,570 psi | 90% | 2556 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,236 psi | 88% | 2507 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 42,786 psi | 87% | 2507 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,317 psi | 72% | 1588 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 44,309 psi | 90% | 2461 fps | 98.9% |
| IMR 4831 | <<locked>> | 94% | 42,656 psi | 87% | 2507 fps | 98.2% |
| IMR 4895 | <<locked>> | 82% | 43,091 psi | 87% | 2490 fps | 99.1% |
| Lovex S062 | <<locked>> | 84% | 43,903 psi | 89% | 2461 fps | 99.8% |
| Lovex S065 | <<locked>> | 90% | 43,395 psi | 88% | 2457 fps | 96.9% |
| Lovex S070 | <<locked>> | 92% | 43,888 psi | 89% | 2484 fps | 95.8% |
| Norma 203B | <<locked>> | 84% | 44,048 psi | 89% | 2500 fps | 99.2% |
| Norma URP | <<locked>> | 94% | 44,382 psi | 90% | 2552 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 84% | 43,859 psi | 89% | 2520 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 94% | 43,337 psi | 88% | 2539 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,766 psi | 73% | 1624 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 42,830 psi | 87% | 2444 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 44,150 psi | 90% | 2559 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 43,947 psi | 89% | 2598 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 44,222 psi | 90% | 2575 fps | 98.2% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 44,193 psi | 90% | 2589 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 82% | 43,323 psi | 88% | 2431 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 88% | 44,150 psi | 90% | 2497 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,395 psi | 88% | 2457 fps | 96.9% |
| Shooters World Precision | <<locked>> | 84% | 43,903 psi | 89% | 2461 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 92% | 43,888 psi | 89% | 2484 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 42,801 psi | 87% | 2507 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 44,338 psi | 90% | 2392 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,322 psi | 86% | 2457 fps | 99.2% |
| Somchem S365 | <<locked>> | 96% | 42,424 psi | 86% | 2559 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 42,757 psi | 87% | 2411 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 43,511 psi | 88% | 2421 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 42,931 psi | 87% | 2438 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 92% | 43,453 psi | 88% | 2500 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 82% | 41,785 psi | 85% | 2411 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 42,888 psi | 87% | 2507 fps | 97.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,944 psi | 83% | 2543 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 43,656 psi | 89% | 2484 fps | 99.5% |
| Winchester 760 | <<locked>> | 92% | 44,570 psi | 90% | 2556 fps | 95.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,562 psi | 68% | 2461 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 82% | 44,527 psi | 90% | 2500 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 2495 | <<locked>> | 80% | 40,001 psi | 81% | 2369 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,855 psi | 77% | 2365 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 33,707 psi | 68% | 2346 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 37,043 psi | 75% | 2329 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,595 psi | 80% | 2497 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,593 psi | 74% | 2352 fps | 98.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,305 psi | 80% | 2408 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,374 psi | 70% | 2362 fps | 95.7% |
| Alliant Reloder-17 | 39.2 gr | 80% | 31,676 psi | 64% | 2323 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,530 psi | 60% | 2267 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,390 psi | 74% | 2493 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 36,361 psi | 74% | 2359 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 80% | 37,246 psi | 76% | 2359 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 90% | 41,626 psi | 84% | 2500 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,544 psi | 60% | 2215 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,885 psi | 81% | 2454 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,411 psi | 54% | 1417 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,841 psi | 79% | 2359 fps | 97.9% |
| IMR 4831 | <<locked>> | 86% | 32,895 psi | 67% | 2310 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 40,234 psi | 82% | 2438 fps | 98.6% |
| Lovex S062 | <<locked>> | 80% | 38,812 psi | 79% | 2369 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 38,479 psi | 78% | 2362 fps | 95.5% |
| Lovex S070 | <<locked>> | 90% | 41,307 psi | 84% | 2434 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 38,667 psi | 78% | 2398 fps | 98.3% |
| Norma URP | <<locked>> | 86% | 34,301 psi | 70% | 2349 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 38,276 psi | 78% | 2415 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 40,582 psi | 82% | 2487 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,629 psi | 54% | 1450 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,059 psi | 81% | 2392 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,336 psi | 84% | 2507 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,721 psi | 68% | 2385 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,750 psi | 68% | 2365 fps | 95% |
| ReloadSwiss RS 70 | 43.8 gr | 88% | 36,405 psi | 74% | 2421 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 40,756 psi | 83% | 2382 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 34,026 psi | 69% | 2303 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,479 psi | 78% | 2362 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 38,812 psi | 79% | 2369 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 90% | 41,307 psi | 84% | 2434 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,099 psi | 71% | 2352 fps | 97.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,680 psi | 74% | 2260 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 34,940 psi | 71% | 2310 fps | 97.8% |
| Somchem S365 | 37.1 gr | 80% | 25,295 psi | 51% | 2149 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 40,089 psi | 81% | 2365 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,625 psi | 82% | 2372 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,156 psi | 67% | 2251 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 33,649 psi | 68% | 2303 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 39,320 psi | 80% | 2369 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 35,215 psi | 71% | 2352 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 92% | 31,517 psi | 64% | 2339 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,559 psi | 60% | 2182 fps | 95.7% |
| Winchester 760 | <<locked>> | 90% | 41,916 psi | 85% | 2507 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,631 psi | 60% | 2339 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,597 psi | 84% | 2448 fps | 99.2% |
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 53 powders for 7 x 57 R loaded with the .284 | 158gr | Sellier & Bellot HPC. Alliant Reloder-26 delivers the highest muzzle velocity at 2,612 fps; across all powders the maximum-charge window runs from 1,588 fps to 2,612 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 53 of the 53 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 68–90 %, leaving at least 10 % headroom. The 158.0 gr projectile in 0.284" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, 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. Somchem S365, ReloadSwiss RS 70, Alliant Reloder-17 rank at the top here: for 7 x 57 R with the .284 | 158gr | Sellier & Bellot HPC 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.