Load Specifications
Load data in caliber 7 x 57 R with .284 | 160gr | 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 Alliant Reloder-17, Alliant Reloder-26 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 3100ᴾ | <<locked>> | 100% | 41,176 psi | 84% | 2474 fps | 96.4% |
| Accurate 4064 | <<locked>> | 82% | 42,322 psi | 86% | 2438 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 43,685 psi | 89% | 2536 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 84% | 43,598 psi | 88% | 2454 fps | 98.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 44,106 psi | 89% | 2585 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 43,294 psi | 88% | 2474 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 82% | 43,627 psi | 88% | 2487 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 92% | 43,076 psi | 87% | 2546 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 88% | 43,091 psi | 87% | 2572 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,276 psi | 80% | 2500 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,932 psi | 89% | 2654 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 43,178 psi | 88% | 2484 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 84% | 44,237 psi | 90% | 2490 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 90% | 43,569 psi | 88% | 2530 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,279 psi | 86% | 2487 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,607 psi | 72% | 1594 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 43,178 psi | 88% | 2438 fps | 99% |
| IMR 4831 | <<locked>> | 92% | 41,785 psi | 85% | 2487 fps | 98.3% |
| Lovex S062 | <<locked>> | 82% | 42,859 psi | 87% | 2434 fps | 99.8% |
| Lovex S065 | <<locked>> | 88% | 42,496 psi | 86% | 2438 fps | 97% |
| Lovex S070 | <<locked>> | 90% | 42,902 psi | 87% | 2464 fps | 96% |
| Norma 203B | <<locked>> | 82% | 42,975 psi | 87% | 2474 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 43,468 psi | 88% | 2530 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 82% | 42,714 psi | 87% | 2490 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 92% | 42,612 psi | 86% | 2523 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,056 psi | 73% | 1631 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,454 psi | 90% | 2470 fps | 96.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 42,975 psi | 87% | 2575 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 43,250 psi | 88% | 2552 fps | 98.3% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 43,250 psi | 88% | 2569 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 86% | 43,352 psi | 88% | 2480 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,496 psi | 86% | 2438 fps | 97% |
| Shooters World Precision | <<locked>> | 82% | 42,859 psi | 87% | 2434 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 90% | 42,902 psi | 87% | 2464 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 44,599 psi | 90% | 2530 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 43,149 psi | 88% | 2365 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 43,903 psi | 89% | 2477 fps | 99.6% |
| Somchem S365 | <<locked>> | 96% | 44,425 psi | 90% | 2585 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 44,599 psi | 90% | 2428 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 42,105 psi | 85% | 2418 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 42,844 psi | 87% | 2484 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 82% | 43,511 psi | 88% | 2434 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 42,003 psi | 85% | 2484 fps | 97.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,062 psi | 87% | 2572 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,699 psi | 87% | 2464 fps | 99.6% |
| Winchester 760 | <<locked>> | 90% | 43,569 psi | 88% | 2530 fps | 96% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,099 psi | 71% | 2503 fps | 99% |
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 3100 | <<locked>> | 98% | 38,348 psi | 78% | 2421 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 39,566 psi | 80% | 2388 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,301 psi | 68% | 2329 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 38,464 psi | 78% | 2356 fps | 97.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,234 psi | 84% | 2530 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,116 psi | 77% | 2379 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,104 psi | 83% | 2438 fps | 98.6% |
| Alliant Reloder-16 | 38.4 gr | 82% | 31,647 psi | 64% | 2290 fps | 95% |
| Alliant Reloder-17 | 40.3 gr | 80% | 32,837 psi | 67% | 2349 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,979 psi | 59% | 2251 fps | 95.5% |
| Alliant Reloder-26 | 48.6 gr | 94% | 35,665 psi | 72% | 2474 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 37,942 psi | 77% | 2385 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 80% | 38,667 psi | 78% | 2385 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 88% | 40,785 psi | 83% | 2477 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,906 psi | 59% | 2195 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 54% | 1424 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,364 psi | 82% | 2385 fps | 98.5% |
| IMR 4831 | <<locked>> | 84% | 32,256 psi | 65% | 2287 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 40,393 psi | 82% | 2392 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,536 psi | 76% | 2339 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 40,234 psi | 82% | 2411 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 40,466 psi | 82% | 2428 fps | 98.9% |
| Norma URP | <<locked>> | 84% | 33,533 psi | 68% | 2326 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 39,958 psi | 81% | 2441 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 37,434 psi | 76% | 2418 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,861 psi | 54% | 1457 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,044 psi | 79% | 2369 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,969 psi | 71% | 2411 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,011 psi | 67% | 2343 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,346 psi | 72% | 2398 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 35,534 psi | 72% | 2329 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,536 psi | 76% | 2339 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 40,393 psi | 82% | 2392 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 40,234 psi | 82% | 2411 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,492 psi | 74% | 2375 fps | 97.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,174 psi | 77% | 2283 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 36,434 psi | 74% | 2336 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 26,411 psi | 54% | 2178 fps | 96.2% |
| Vihtavuori N135 | <<locked>> | 80% | 41,901 psi | 85% | 2388 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,577 psi | 70% | 2274 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 32,880 psi | 67% | 2280 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 40,741 psi | 83% | 2388 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,679 psi | 70% | 2336 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 31,096 psi | 63% | 2320 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,719 psi | 62% | 2211 fps | 96.7% |
| Winchester 760 | <<locked>> | 88% | 40,785 psi | 83% | 2477 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,153 psi | 59% | 2329 fps | 96.1% |
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 | 160gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,654 fps; across all powders the maximum-charge window runs from 1,594 fps to 2,654 fps. Accurate 3100 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 71–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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, Alliant Reloder-26, Alliant Reloder-16 rank at the top here: for 7 x 57 R with the .284 | 160gr | 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.