Load Specifications
Load data in caliber 7 x 57 R with .284 | 175gr | 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-26, 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 3100ᴾ | <<locked>> | 100% | 44,121 psi | 89% | 2418 fps | 98% |
| Accurate 4350 | <<locked>> | 90% | 43,729 psi | 89% | 2425 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 82% | 43,091 psi | 87% | 2333 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 43,018 psi | 87% | 2356 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 42,786 psi | 87% | 2431 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 86% | 42,699 psi | 87% | 2451 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,655 psi | 84% | 2438 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 36,796 psi | 75% | 2352 fps | 96.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 43,642 psi | 89% | 2539 fps | 99.2% |
| Bofors RP3 | <<locked>> | 82% | 42,801 psi | 87% | 2359 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 43,323 psi | 88% | 2336 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 82% | 43,439 psi | 88% | 2365 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 88% | 43,265 psi | 88% | 2418 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 42,148 psi | 85% | 2372 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 42,627 psi | 86% | 2431 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,984 psi | 73% | 1519 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 43,511 psi | 88% | 2365 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,438 psi | 86% | 2323 fps | 96.4% |
| IMR 4831 | <<locked>> | 92% | 44,483 psi | 90% | 2421 fps | 99.3% |
| Lovex S065 | <<locked>> | 88% | 44,570 psi | 90% | 2365 fps | 98.3% |
| Lovex S070 | <<locked>> | 88% | 42,627 psi | 86% | 2349 fps | 96.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 36,593 psi | 74% | 2283 fps | 96.1% |
| Norma MRP | <<locked>> | 98% | 43,526 psi | 88% | 2497 fps | 96.8% |
| Norma URP | <<locked>> | 90% | 43,366 psi | 88% | 2415 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 90% | 42,061 psi | 85% | 2405 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,521 psi | 74% | 1555 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,671 psi | 89% | 2352 fps | 97.5% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 42,511 psi | 86% | 2451 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 43,250 psi | 88% | 2441 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 42,670 psi | 87% | 2454 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 84% | 42,975 psi | 87% | 2359 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 43,323 psi | 88% | 2336 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 44,570 psi | 90% | 2365 fps | 98.3% |
| Shooters World SW4350 | <<locked>> | 88% | 42,627 psi | 86% | 2349 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 44,077 psi | 89% | 2408 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 42,511 psi | 86% | 2244 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,135 psi | 90% | 2320 fps | 97% |
| Somchem S355 | <<locked>> | 84% | 43,685 psi | 89% | 2359 fps | 99.9% |
| Somchem S365 | <<locked>> | 94% | 44,367 psi | 90% | 2467 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 44,121 psi | 89% | 2411 fps | 96.4% |
| Vihtavuori N150 | <<locked>> | 86% | 44,280 psi | 90% | 2339 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 42,380 psi | 86% | 2362 fps | 98.8% |
| Vihtavuori N550 | <<locked>> | 90% | 44,556 psi | 90% | 2418 fps | 99% |
| Vihtavuori N555 | <<locked>> | 98% | 43,294 psi | 88% | 2461 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 42,090 psi | 85% | 2346 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 43,265 psi | 88% | 2418 fps | 96.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,376 psi | 76% | 2464 fps | 100% |
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>> | 92% | 33,576 psi | 68% | 2221 fps | 95% |
| Accurate 4350 | <<locked>> | 80% | 31,111 psi | 63% | 2175 fps | 96% |
| ADI AR 2208 | <<locked>> | 80% | 40,321 psi | 82% | 2283 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,190 psi | 82% | 2306 fps | 99.7% |
| Alliant Reloder-16 | 36.7 gr | 80% | 31,372 psi | 64% | 2185 fps | 96.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,853 psi | 71% | 2297 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,253 psi | 55% | 2110 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 98% | 34,722 psi | 70% | 2303 fps | 95.6% |
| Alliant Reloder-26 | 45.5 gr | 90% | 33,025 psi | 67% | 2313 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 40,190 psi | 82% | 2316 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 40,799 psi | 83% | 2290 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 40,857 psi | 83% | 2320 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 37,971 psi | 77% | 2316 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,747 psi | 58% | 2096 fps | 96.9% |
| Hodgdon Superformance | <<locked>> | 86% | 39,885 psi | 81% | 2379 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,789 psi | 54% | 1355 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 40,988 psi | 83% | 2316 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,726 psi | 81% | 2270 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 30,168 psi | 61% | 2136 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 34,867 psi | 71% | 2182 fps | 95.7% |
| Lovex S070 | <<locked>> | 84% | 37,579 psi | 76% | 2254 fps | 95.4% |
| Lovex S071 | <<locked>> | 98% | 34,316 psi | 70% | 2238 fps | 95.2% |
| Norma MRP | <<locked>> | 94% | 38,305 psi | 78% | 2395 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 31,256 psi | 63% | 2172 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 84% | 34,693 psi | 70% | 2257 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,064 psi | 55% | 1385 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,162 psi | 83% | 2306 fps | 96.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,072 psi | 75% | 2349 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,806 psi | 62% | 2188 fps | 95.4% |
| ReloadSwiss RS 70 | 41.1 gr | 82% | 32,750 psi | 66% | 2238 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 37,652 psi | 76% | 2264 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 40,799 psi | 83% | 2290 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,867 psi | 71% | 2182 fps | 95.7% |
| Shooters World SW4350 | <<locked>> | 84% | 37,579 psi | 76% | 2254 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,725 psi | 79% | 2313 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,958 psi | 81% | 2201 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,769 psi | 79% | 2224 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 38,392 psi | 78% | 2267 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 28,021 psi | 57% | 2133 fps | 98.1% |
| Somchem S385 | <<locked>> | 94% | 41,205 psi | 84% | 2359 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 36,477 psi | 74% | 2208 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 32,764 psi | 66% | 2178 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 80% | 32,227 psi | 65% | 2178 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 84% | 27,572 psi | 56% | 2129 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,256 psi | 65% | 2152 fps | 98.3% |
| Winchester 760 | <<locked>> | 84% | 37,971 psi | 77% | 2316 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,614 psi | 52% | 2126 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 | 175gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,539 fps; across all powders the maximum-charge window runs from 1,519 fps to 2,539 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 73–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for 7 x 57 R with the .284 | 175gr | 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.