Load Specifications
Load data in caliber 7 x 57 R with .284 | 160gr | Sierra SBT 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-26, Alliant Reloder-16 and Somchem S365.
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% | 41,756 psi | 85% | 2487 fps | 96.6% |
| Accurate 4064 | <<locked>> | 82% | 42,859 psi | 87% | 2448 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 44,411 psi | 90% | 2552 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 84% | 44,005 psi | 89% | 2464 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 44,063 psi | 89% | 2490 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 82% | 44,396 psi | 90% | 2503 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 92% | 43,714 psi | 89% | 2566 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 88% | 43,729 psi | 89% | 2589 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,074 psi | 81% | 2520 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 41,495 psi | 84% | 2612 fps | 98% |
| Bofors RP3 | <<locked>> | 84% | 43,947 psi | 89% | 2500 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 82% | 41,771 psi | 85% | 2451 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 90% | 44,237 psi | 90% | 2549 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,946 psi | 87% | 2500 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,592 psi | 72% | 1598 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 43,642 psi | 89% | 2451 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,439 psi | 88% | 2451 fps | 95.8% |
| IMR 4831 | <<locked>> | 92% | 42,453 psi | 86% | 2503 fps | 98.5% |
| Lovex S062 | <<locked>> | 82% | 43,642 psi | 89% | 2454 fps | 99.9% |
| Lovex S065 | <<locked>> | 88% | 42,859 psi | 87% | 2448 fps | 97.2% |
| Lovex S070 | <<locked>> | 90% | 43,569 psi | 88% | 2480 fps | 96.2% |
| Norma 203B | <<locked>> | 82% | 43,743 psi | 89% | 2493 fps | 99.4% |
| Norma MRPᴾ | <<locked>> | 100% | 44,498 psi | 90% | 2628 fps | 96.1% |
| Norma URP | <<locked>> | 92% | 44,150 psi | 90% | 2546 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 82% | 43,453 psi | 88% | 2510 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 92% | 43,163 psi | 88% | 2539 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,056 psi | 73% | 1637 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,322 psi | 86% | 2438 fps | 96.3% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 43,598 psi | 88% | 2592 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 44,179 psi | 90% | 2575 fps | 98.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 44,034 psi | 89% | 2592 fps | 98.1% |
| Rottweil R 903 | <<locked>> | 86% | 43,830 psi | 89% | 2490 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,859 psi | 87% | 2448 fps | 97.2% |
| Shooters World Precision | <<locked>> | 82% | 43,642 psi | 89% | 2454 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 90% | 43,569 psi | 88% | 2480 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 42,395 psi | 86% | 2497 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 43,598 psi | 88% | 2379 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 44,614 psi | 90% | 2497 fps | 99.7% |
| Somchem S365 | <<locked>> | 94% | 42,438 psi | 86% | 2556 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 42,511 psi | 86% | 2428 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 43,497 psi | 88% | 2500 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 82% | 43,932 psi | 89% | 2444 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 42,612 psi | 86% | 2500 fps | 98.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,034 psi | 89% | 2592 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 43,221 psi | 88% | 2477 fps | 99.7% |
| Winchester 760 | <<locked>> | 90% | 44,237 psi | 90% | 2549 fps | 96.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,752 psi | 73% | 2526 fps | 99.3% |
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 3100 | <<locked>> | 96% | 36,550 psi | 74% | 2388 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 40,118 psi | 81% | 2402 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,691 psi | 64% | 2293 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 38,885 psi | 79% | 2369 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,595 psi | 78% | 2388 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,568 psi | 84% | 2451 fps | 98.7% |
| Alliant Reloder-16 | 38.9 gr | 82% | 32,024 psi | 65% | 2303 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,417 psi | 68% | 2369 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 29,457 psi | 60% | 2270 fps | 95.9% |
| Alliant Reloder-26 | 48.2 gr | 92% | 33,823 psi | 69% | 2434 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 38,377 psi | 78% | 2398 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 80% | 39,117 psi | 79% | 2398 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 88% | 41,394 psi | 84% | 2493 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,586 psi | 56% | 2162 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,484 psi | 54% | 1424 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,843 psi | 83% | 2402 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,799 psi | 83% | 2402 fps | 95% |
| IMR 4831 | <<locked>> | 84% | 32,895 psi | 67% | 2306 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 40,886 psi | 83% | 2405 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 35,810 psi | 73% | 2306 fps | 95.1% |
| Lovex S070 | <<locked>> | 88% | 40,857 psi | 83% | 2428 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 40,944 psi | 83% | 2441 fps | 99% |
| Norma MRP | <<locked>> | 98% | 41,669 psi | 85% | 2572 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 31,952 psi | 65% | 2293 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 40,379 psi | 82% | 2454 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 37,985 psi | 77% | 2434 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,977 psi | 55% | 1463 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,436 psi | 80% | 2382 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,592 psi | 72% | 2431 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 33,576 psi | 68% | 2359 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,824 psi | 73% | 2415 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 36,274 psi | 74% | 2349 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,810 psi | 73% | 2306 fps | 95.1% |
| Shooters World Precision | <<locked>> | 80% | 40,886 psi | 83% | 2405 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 40,857 psi | 83% | 2428 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,173 psi | 75% | 2395 fps | 98.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,638 psi | 78% | 2293 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 36,898 psi | 75% | 2349 fps | 98.6% |
| Somchem S365 | 38.8 gr | 80% | 26,948 psi | 55% | 2201 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 35,273 psi | 72% | 2293 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 33,489 psi | 68% | 2297 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 41,191 psi | 84% | 2398 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,822 psi | 67% | 2297 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 29,646 psi | 60% | 2287 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,995 psi | 63% | 2221 fps | 96.9% |
| Winchester 760 | <<locked>> | 88% | 41,394 psi | 84% | 2493 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,731 psi | 56% | 2287 fps | 95.2% |
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 SBT GameKing. Norma MRP delivers the highest muzzle velocity at 2,628 fps; across all powders the maximum-charge window runs from 1,598 fps to 2,628 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 72–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, 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-26, Alliant Reloder-16, Somchem S365 rank at the top here: for 7 x 57 R with the .284 | 160gr | Sierra SBT 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.