Load Specifications
Load data in caliber 7 x 57 R with .284 | 150gr | Barnes X S bullet and 39 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 70 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 4064 | <<locked>> | 82% | 43,874 psi | 89% | 2513 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 44,396 psi | 90% | 2602 fps | 98% |
| ADI AR 2208 | <<locked>> | 84% | 43,816 psi | 89% | 2510 fps | 98.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 44,251 psi | 90% | 2638 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 44,092 psi | 89% | 2539 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 82% | 44,382 psi | 90% | 2552 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 92% | 43,352 psi | 88% | 2602 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 88% | 43,395 psi | 88% | 2631 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,987 psi | 81% | 2559 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,266 psi | 90% | 2707 fps | 97.6% |
| Bofors RP3 | <<locked>> | 84% | 44,048 psi | 89% | 2549 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 82% | 42,119 psi | 85% | 2500 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,627 psi | 86% | 2543 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 73% | 1637 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 43,526 psi | 88% | 2493 fps | 98.4% |
| IMR 4831 | <<locked>> | 92% | 42,351 psi | 86% | 2549 fps | 97.6% |
| Lovex S062 | <<locked>> | 82% | 43,859 psi | 89% | 2503 fps | 99.6% |
| Lovex S065 | <<locked>> | 88% | 43,236 psi | 88% | 2497 fps | 96.3% |
| Norma 203B | <<locked>> | 82% | 43,787 psi | 89% | 2543 fps | 98.8% |
| Norma URP | <<locked>> | 92% | 43,743 psi | 89% | 2589 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 82% | 42,975 psi | 87% | 2549 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,405 psi | 74% | 1677 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 43,250 psi | 88% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 43,671 psi | 89% | 2615 fps | 97.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 43,671 psi | 89% | 2621 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 86% | 44,208 psi | 90% | 2546 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 43,236 psi | 88% | 2497 fps | 96.3% |
| Shooters World Precision | <<locked>> | 82% | 43,859 psi | 89% | 2503 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 42,061 psi | 85% | 2539 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 43,439 psi | 88% | 2425 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 42,090 psi | 85% | 2497 fps | 98.9% |
| Somchem S365 | <<locked>> | 94% | 41,959 psi | 85% | 2598 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 86% | 42,670 psi | 87% | 2480 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 90% | 43,105 psi | 87% | 2539 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 82% | 44,034 psi | 89% | 2497 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 42,525 psi | 86% | 2543 fps | 97.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,497 psi | 88% | 2635 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,859 psi | 87% | 2516 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,129 psi | 73% | 2562 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 4064 | <<locked>> | 80% | 41,495 psi | 84% | 2470 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,505 psi | 70% | 2398 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 39,131 psi | 79% | 2415 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,553 psi | 84% | 2585 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,073 psi | 79% | 2444 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,713 psi | 85% | 2500 fps | 98% |
| Alliant Reloder-16 | 38.9 gr | 84% | 34,505 psi | 70% | 2398 fps | 95% |
| Alliant Reloder-17 | 39.9 gr | 80% | 33,881 psi | 69% | 2415 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,981 psi | 65% | 2365 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,754 psi | 79% | 2585 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 39,030 psi | 79% | 2454 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 80% | 39,537 psi | 80% | 2448 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,139 psi | 61% | 2260 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,876 psi | 55% | 1463 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,104 psi | 83% | 2448 fps | 97.9% |
| IMR 4831 | <<locked>> | 86% | 35,404 psi | 72% | 2405 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 41,466 psi | 84% | 2457 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 40,901 psi | 83% | 2451 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 41,118 psi | 83% | 2490 fps | 98.4% |
| Norma URP | <<locked>> | 84% | 34,577 psi | 70% | 2395 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 40,379 psi | 82% | 2500 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,441 psi | 56% | 1503 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,897 psi | 73% | 2477 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,143 psi | 73% | 2457 fps | 95.3% |
| ReloadSwiss RS 70 | 44.5 gr | 88% | 38,363 psi | 78% | 2507 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 36,956 psi | 75% | 2402 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,901 psi | 83% | 2451 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 41,466 psi | 84% | 2457 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,362 psi | 76% | 2441 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,624 psi | 78% | 2339 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 37,623 psi | 76% | 2405 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 27,833 psi | 56% | 2254 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 35,694 psi | 72% | 2343 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 35,853 psi | 73% | 2392 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 41,379 psi | 84% | 2451 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,520 psi | 72% | 2398 fps | 95% |
| Vihtavuori N555 | <<locked>> | 90% | 32,300 psi | 66% | 2392 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,633 psi | 64% | 2270 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,269 psi | 61% | 2385 fps | 95% |
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 39 powders for 7 x 57 R loaded with the .284 | 150gr | Barnes X S. Alliant Reloder-26 delivers the highest muzzle velocity at 2,707 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,707 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 39 of the 39 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 150.0 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. Alliant Reloder-17, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for 7 x 57 R with the .284 | 150gr | Barnes X S 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.