Load Specifications
Load data in caliber 7 x 57 R with .284 | 158gr | Sellier & Bellot XRG bullet and 50 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% | 43,192 psi | 88% | 2425 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 43,395 psi | 88% | 2464 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,206 psi | 86% | 2516 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 84% | 42,308 psi | 86% | 2438 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,801 psi | 87% | 2566 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,177 psi | 86% | 2461 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,525 psi | 86% | 2474 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 94% | 44,454 psi | 90% | 2579 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 90% | 44,498 psi | 90% | 2602 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,956 psi | 77% | 2477 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,308 psi | 86% | 2625 fps | 97.7% |
| Bofors RP3 | <<locked>> | 84% | 41,742 psi | 85% | 2464 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 84% | 42,888 psi | 87% | 2474 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,642 psi | 89% | 2516 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 43,250 psi | 88% | 2516 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,491 psi | 72% | 1594 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 44,469 psi | 90% | 2467 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 82% | 44,425 psi | 90% | 2438 fps | 95.7% |
| IMR 4831 | <<locked>> | 94% | 43,062 psi | 87% | 2516 fps | 98.3% |
| IMR 4895 | <<locked>> | 82% | 43,540 psi | 88% | 2500 fps | 99.2% |
| Lovex S062 | <<locked>> | 84% | 44,396 psi | 90% | 2470 fps | 99.8% |
| Lovex S065 | <<locked>> | 90% | 43,787 psi | 89% | 2467 fps | 97% |
| Lovex S070 | <<locked>> | 92% | 44,251 psi | 90% | 2493 fps | 96% |
| Norma 203B | <<locked>> | 84% | 44,483 psi | 90% | 2510 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 42,076 psi | 85% | 2513 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 84% | 44,266 psi | 90% | 2526 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 94% | 43,990 psi | 89% | 2552 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,940 psi | 73% | 1631 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,221 psi | 88% | 2454 fps | 96.1% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 44,280 psi | 90% | 2605 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 44,614 psi | 90% | 2585 fps | 98.3% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,916 psi | 85% | 2546 fps | 97.1% |
| Rottweil R 902 | <<locked>> | 82% | 43,787 psi | 89% | 2441 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 88% | 44,614 psi | 90% | 2510 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,787 psi | 89% | 2467 fps | 97% |
| Shooters World Precision | <<locked>> | 84% | 44,396 psi | 90% | 2470 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 92% | 44,251 psi | 90% | 2493 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,236 psi | 88% | 2513 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 44,498 psi | 90% | 2395 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,786 psi | 87% | 2467 fps | 99.3% |
| Somchem S365 | <<locked>> | 96% | 42,772 psi | 87% | 2566 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 43,352 psi | 88% | 2421 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 43,729 psi | 89% | 2428 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,366 psi | 88% | 2448 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 92% | 44,193 psi | 90% | 2513 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 82% | 42,177 psi | 86% | 2421 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,279 psi | 88% | 2513 fps | 97.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,336 psi | 84% | 2549 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 44,208 psi | 90% | 2497 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,040 psi | 69% | 2477 fps | 98.3% |
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% | 40,553 psi | 82% | 2382 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,363 psi | 78% | 2375 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,156 psi | 69% | 2356 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 37,463 psi | 76% | 2343 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,001 psi | 81% | 2510 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,028 psi | 75% | 2362 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,755 psi | 81% | 2421 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,721 psi | 66% | 2323 fps | 95.1% |
| Alliant Reloder-17 | 39.6 gr | 80% | 32,010 psi | 65% | 2333 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,776 psi | 60% | 2277 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,883 psi | 75% | 2507 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 36,550 psi | 74% | 2365 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 80% | 37,391 psi | 76% | 2365 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,108 psi | 57% | 2178 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,364 psi | 82% | 2464 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 54% | 1421 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,334 psi | 80% | 2372 fps | 98% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,887 psi | 85% | 2392 fps | 95% |
| IMR 4831 | <<locked>> | 86% | 33,301 psi | 68% | 2320 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 40,727 psi | 83% | 2448 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 39,276 psi | 80% | 2379 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 38,899 psi | 79% | 2372 fps | 95.7% |
| Lovex S070 | <<locked>> | 90% | 41,669 psi | 85% | 2444 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 39,146 psi | 79% | 2411 fps | 98.4% |
| Norma URP | <<locked>> | 86% | 34,679 psi | 70% | 2362 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 38,696 psi | 78% | 2425 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 38,551 psi | 78% | 2448 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,861 psi | 54% | 1460 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,466 psi | 82% | 2402 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,098 psi | 69% | 2395 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,098 psi | 69% | 2375 fps | 95.2% |
| ReloadSwiss RS 70 | 44.2 gr | 88% | 36,724 psi | 74% | 2434 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 41,234 psi | 84% | 2395 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 34,461 psi | 70% | 2313 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,899 psi | 79% | 2372 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 39,276 psi | 80% | 2379 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 41,669 psi | 85% | 2444 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,288 psi | 72% | 2356 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,144 psi | 75% | 2270 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,375 psi | 72% | 2320 fps | 97.9% |
| Somchem S365 | 37.5 gr | 80% | 25,628 psi | 52% | 2162 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 40,640 psi | 82% | 2375 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,089 psi | 83% | 2382 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,605 psi | 68% | 2264 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 33,997 psi | 69% | 2313 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 39,465 psi | 80% | 2372 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,504 psi | 68% | 2316 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 31,879 psi | 65% | 2349 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,834 psi | 61% | 2192 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,878 psi | 61% | 2349 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 50 powders for 7 x 57 R loaded with the .284 | 158gr | Sellier & Bellot XRG. Alliant Reloder-26 delivers the highest muzzle velocity at 2,625 fps; across all powders the maximum-charge window runs from 1,594 fps to 2,625 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 50 of the 50 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 158.0 gr projectile in 0.284" calls for a 1:10.5 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 XRG 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.