Load Specifications
Load data in caliber 7 x 57 R with .284 | 150gr | Sierra MatchKing bullet and 49 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% | 43,366 psi | 88% | 2507 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 43,743 psi | 89% | 2549 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,235 psi | 86% | 2595 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 84% | 42,670 psi | 87% | 2520 fps | 98.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,815 psi | 87% | 2648 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,206 psi | 86% | 2543 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,598 psi | 86% | 2552 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 94% | 44,512 psi | 90% | 2661 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 88% | 41,858 psi | 85% | 2635 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,218 psi | 78% | 2559 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,569 psi | 86% | 2710 fps | 97.5% |
| Bofors RP3 | <<locked>> | 84% | 41,901 psi | 85% | 2546 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 42,975 psi | 87% | 2552 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,947 psi | 89% | 2602 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 43,366 psi | 88% | 2598 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,317 psi | 72% | 1654 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,003 psi | 85% | 2500 fps | 98.4% |
| IMR 4831 | <<locked>> | 94% | 43,337 psi | 88% | 2602 fps | 98.1% |
| IMR 4895 | <<locked>> | 82% | 43,613 psi | 88% | 2582 fps | 99% |
| Lovex S062 | <<locked>> | 82% | 41,916 psi | 85% | 2507 fps | 99.5% |
| Lovex S065 | <<locked>> | 90% | 44,019 psi | 89% | 2549 fps | 96.8% |
| Lovex S070 | <<locked>> | 92% | 44,338 psi | 90% | 2572 fps | 95.7% |
| Norma 203B | <<locked>> | 82% | 41,916 psi | 85% | 2543 fps | 98.7% |
| Norma URP | <<locked>> | 92% | 42,206 psi | 86% | 2592 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 84% | 44,483 psi | 90% | 2612 fps | 99% |
| Ramshot Hunter | <<locked>> | 94% | 44,005 psi | 89% | 2631 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,013 psi | 73% | 1696 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,497 psi | 88% | 2539 fps | 95.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 41,814 psi | 85% | 2641 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,989 psi | 85% | 2618 fps | 97.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,163 psi | 86% | 2628 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 82% | 43,758 psi | 89% | 2520 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 86% | 42,090 psi | 85% | 2543 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 44,019 psi | 89% | 2549 fps | 96.8% |
| Shooters World Precision | <<locked>> | 82% | 41,916 psi | 85% | 2507 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 92% | 44,338 psi | 90% | 2572 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,468 psi | 88% | 2598 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 41,989 psi | 85% | 2434 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 43,004 psi | 87% | 2549 fps | 99.2% |
| Somchem S365 | <<locked>> | 96% | 43,192 psi | 88% | 2654 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 43,323 psi | 88% | 2500 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 44,092 psi | 89% | 2513 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,743 psi | 89% | 2533 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 92% | 44,222 psi | 90% | 2592 fps | 98% |
| Vihtavuori N540 | <<locked>> | 82% | 42,438 psi | 86% | 2503 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,482 psi | 88% | 2595 fps | 97.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,640 psi | 84% | 2631 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 44,425 psi | 90% | 2575 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,185 psi | 69% | 2552 fps | 98% |
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% | 40,814 psi | 83% | 2464 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,580 psi | 78% | 2457 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,534 psi | 70% | 2438 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 37,724 psi | 77% | 2421 fps | 97.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,147 psi | 81% | 2592 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,275 psi | 76% | 2441 fps | 98.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,914 psi | 81% | 2500 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,896 psi | 71% | 2448 fps | 95.6% |
| Alliant Reloder-17 | 41.4 gr | 80% | 31,981 psi | 65% | 2405 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,095 psi | 61% | 2352 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 37,101 psi | 75% | 2585 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 36,666 psi | 74% | 2441 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 80% | 37,695 psi | 76% | 2448 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,965 psi | 61% | 2297 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,596 psi | 82% | 2546 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,353 psi | 53% | 1476 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,610 psi | 80% | 2454 fps | 97.8% |
| IMR 4831 | <<locked>> | 86% | 33,431 psi | 68% | 2395 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 40,872 psi | 83% | 2530 fps | 98.6% |
| Lovex S062 | <<locked>> | 80% | 39,276 psi | 80% | 2454 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 39,030 psi | 79% | 2451 fps | 95.4% |
| Lovex S070 | <<locked>> | 90% | 41,872 psi | 85% | 2526 fps | 95% |
| Norma 203B | <<locked>> | 80% | 39,305 psi | 80% | 2490 fps | 98.2% |
| Norma URP | <<locked>> | 86% | 34,824 psi | 71% | 2434 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 38,812 psi | 79% | 2500 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 92% | 41,336 psi | 84% | 2582 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,803 psi | 54% | 1516 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,567 psi | 82% | 2480 fps | 95% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,026 psi | 69% | 2467 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,521 psi | 74% | 2503 fps | 95.8% |
| ReloadSwiss RS 70 | 47.4 gr | 90% | 39,552 psi | 80% | 2572 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 41,278 psi | 84% | 2474 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 34,664 psi | 70% | 2392 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,030 psi | 79% | 2451 fps | 95.4% |
| Shooters World Precision | <<locked>> | 80% | 39,276 psi | 80% | 2454 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 90% | 41,872 psi | 85% | 2526 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,534 psi | 72% | 2438 fps | 97.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,246 psi | 76% | 2349 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,592 psi | 72% | 2398 fps | 97.7% |
| Somchem S365 | 40.3 gr | 82% | 27,470 psi | 56% | 2283 fps | 95.9% |
| Vihtavuori N135 | <<locked>> | 80% | 40,770 psi | 83% | 2457 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,307 psi | 84% | 2464 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,765 psi | 68% | 2339 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 84% | 34,185 psi | 69% | 2388 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 39,813 psi | 81% | 2454 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 35,839 psi | 73% | 2441 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 92% | 32,242 psi | 65% | 2428 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,907 psi | 61% | 2260 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,197 psi | 61% | 2428 fps | 95.7% |
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 49 powders for 7 x 57 R loaded with the .284 | 150gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,710 fps; across all powders the maximum-charge window runs from 1,654 fps to 2,710 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 49 of the 49 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 150.0 gr projectile in 0.284" calls for a 1:11.5 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 | 150gr | Sierra MatchKing 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.