Load Specifications
Load data in caliber 7 x 57 R with .284 | 150gr | Sierra GameKing bullet and 47 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% | 43,874 psi | 89% | 2516 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 43,903 psi | 89% | 2556 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,670 psi | 87% | 2605 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 84% | 42,772 psi | 87% | 2523 fps | 98.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 43,207 psi | 88% | 2657 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,598 psi | 86% | 2549 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,699 psi | 87% | 2559 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,119 psi | 85% | 2615 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 88% | 42,221 psi | 86% | 2644 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,522 psi | 78% | 2569 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,888 psi | 87% | 2720 fps | 97.7% |
| Bofors RP3 | <<locked>> | 84% | 42,322 psi | 86% | 2556 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 43,091 psi | 87% | 2559 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 44,005 psi | 89% | 2605 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 43,772 psi | 89% | 2608 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,346 psi | 72% | 1657 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,119 psi | 85% | 2507 fps | 98.4% |
| IMR 4831 | <<locked>> | 94% | 43,700 psi | 89% | 2608 fps | 98.2% |
| IMR 4895 | <<locked>> | 82% | 43,743 psi | 89% | 2585 fps | 99.1% |
| Lovex S062 | <<locked>> | 82% | 42,090 psi | 85% | 2510 fps | 99.5% |
| Lovex S065 | <<locked>> | 90% | 44,106 psi | 89% | 2552 fps | 96.9% |
| Norma 203B | <<locked>> | 82% | 42,076 psi | 85% | 2546 fps | 98.8% |
| Norma URP | <<locked>> | 92% | 42,583 psi | 86% | 2602 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 82% | 41,800 psi | 85% | 2562 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 94% | 44,353 psi | 90% | 2641 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,042 psi | 73% | 1699 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,598 psi | 88% | 2543 fps | 95.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 41,930 psi | 85% | 2644 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 42,322 psi | 86% | 2625 fps | 97.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,409 psi | 86% | 2638 fps | 97% |
| Rottweil R 902 | <<locked>> | 82% | 44,193 psi | 90% | 2530 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 86% | 42,511 psi | 86% | 2552 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 44,106 psi | 89% | 2552 fps | 96.9% |
| Shooters World Precision | <<locked>> | 82% | 42,090 psi | 85% | 2510 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,569 psi | 88% | 2602 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,424 psi | 86% | 2444 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 43,149 psi | 88% | 2552 fps | 99.2% |
| Somchem S365 | <<locked>> | 96% | 43,308 psi | 88% | 2657 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 43,555 psi | 88% | 2507 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 44,222 psi | 90% | 2516 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,845 psi | 89% | 2536 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 92% | 44,614 psi | 90% | 2602 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 82% | 42,540 psi | 86% | 2507 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,845 psi | 89% | 2605 fps | 97.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,974 psi | 85% | 2641 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 41,756 psi | 85% | 2530 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,418 psi | 70% | 2562 fps | 98.2% |
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 2495 | <<locked>> | 80% | 41,017 psi | 83% | 2467 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,769 psi | 79% | 2461 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,650 psi | 70% | 2441 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 37,840 psi | 77% | 2428 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,234 psi | 82% | 2595 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,405 psi | 76% | 2448 fps | 98.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,059 psi | 81% | 2507 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,012 psi | 71% | 2454 fps | 95.7% |
| Alliant Reloder-17 | 41.7 gr | 80% | 32,300 psi | 66% | 2415 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,168 psi | 61% | 2356 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 37,362 psi | 76% | 2592 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 37,072 psi | 75% | 2451 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 80% | 37,840 psi | 77% | 2451 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,240 psi | 61% | 2306 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,756 psi | 83% | 2552 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,426 psi | 54% | 1480 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,740 psi | 81% | 2461 fps | 97.9% |
| IMR 4831 | <<locked>> | 86% | 33,794 psi | 69% | 2405 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 41,017 psi | 83% | 2533 fps | 98.6% |
| Lovex S062 | <<locked>> | 80% | 39,697 psi | 81% | 2464 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 39,146 psi | 79% | 2454 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 39,421 psi | 80% | 2493 fps | 98.3% |
| Norma URP | <<locked>> | 86% | 35,172 psi | 71% | 2448 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 38,943 psi | 79% | 2507 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 41,626 psi | 84% | 2589 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,876 psi | 55% | 1519 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,944 psi | 83% | 2490 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,360 psi | 70% | 2477 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,577 psi | 70% | 2461 fps | 95.1% |
| ReloadSwiss RS 70 | 46.6 gr | 88% | 37,188 psi | 75% | 2520 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 41,408 psi | 84% | 2477 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 34,838 psi | 71% | 2395 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,146 psi | 79% | 2454 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 39,697 psi | 81% | 2464 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,679 psi | 72% | 2441 fps | 97.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,391 psi | 76% | 2352 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,737 psi | 72% | 2405 fps | 97.8% |
| Somchem S365 | 39.5 gr | 80% | 25,860 psi | 52% | 2234 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 40,973 psi | 83% | 2464 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,481 psi | 84% | 2470 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,910 psi | 69% | 2343 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 34,316 psi | 70% | 2392 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 39,929 psi | 81% | 2461 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 36,187 psi | 73% | 2451 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 92% | 32,358 psi | 66% | 2431 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,168 psi | 61% | 2270 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,400 psi | 62% | 2438 fps | 95.9% |
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 | 150gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,720 fps; across all powders the maximum-charge window runs from 1,657 fps to 2,720 fps. Alliant Reloder-23 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 70–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:12.0 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 GameKing 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.