Load Specifications
Load data in caliber 7 x 57 R with .284 | 170gr | Geco PLUS bullet and 46 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 3100 | <<locked>> | 98% | 42,032 psi | 85% | 2428 fps | 97.5% |
| Accurate 4350 | <<locked>> | 90% | 44,570 psi | 90% | 2484 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 82% | 43,671 psi | 89% | 2388 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 43,598 psi | 88% | 2408 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 43,279 psi | 88% | 2487 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 86% | 43,424 psi | 88% | 2510 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,598 psi | 86% | 2500 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,521 psi | 76% | 2411 fps | 96.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 41,452 psi | 84% | 2546 fps | 98.7% |
| Bofors RP3 | <<locked>> | 82% | 43,598 psi | 88% | 2418 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 43,932 psi | 89% | 2392 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 82% | 44,179 psi | 90% | 2425 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 88% | 44,005 psi | 89% | 2474 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 42,960 psi | 87% | 2431 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 43,540 psi | 88% | 2493 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,926 psi | 73% | 1555 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 44,251 psi | 90% | 2421 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,830 psi | 87% | 2375 fps | 96.4% |
| IMR 4831 | <<locked>> | 90% | 42,583 psi | 86% | 2434 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 42,656 psi | 87% | 2379 fps | 97.8% |
| Lovex S070 | <<locked>> | 88% | 43,163 psi | 88% | 2405 fps | 96.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,391 psi | 76% | 2339 fps | 96.2% |
| Norma MRP | <<locked>> | 98% | 44,614 psi | 90% | 2566 fps | 97% |
| Norma URP | <<locked>> | 90% | 44,164 psi | 90% | 2474 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 90% | 42,917 psi | 87% | 2464 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,448 psi | 74% | 1594 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 44,599 psi | 90% | 2411 fps | 97.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 43,033 psi | 87% | 2507 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 44,179 psi | 90% | 2500 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 43,381 psi | 88% | 2513 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 84% | 43,787 psi | 89% | 2418 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 43,932 psi | 89% | 2392 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 42,656 psi | 87% | 2379 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 88% | 43,163 psi | 88% | 2405 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 41,872 psi | 85% | 2415 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 43,192 psi | 88% | 2300 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,047 psi | 85% | 2326 fps | 96.4% |
| Somchem S355 | <<locked>> | 84% | 44,164 psi | 90% | 2415 fps | 99.9% |
| Somchem S365 | <<locked>> | 92% | 42,351 psi | 86% | 2480 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 42,351 psi | 86% | 2356 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 43,192 psi | 88% | 2425 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 88% | 42,380 psi | 86% | 2425 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 98% | 44,164 psi | 90% | 2520 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 42,801 psi | 87% | 2402 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 44,005 psi | 89% | 2474 fps | 97% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,014 psi | 77% | 2523 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% | 34,185 psi | 69% | 2274 fps | 95% |
| Accurate 4350 | <<locked>> | 80% | 31,662 psi | 64% | 2228 fps | 96.1% |
| ADI AR 2208 | <<locked>> | 80% | 40,930 psi | 83% | 2339 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,843 psi | 83% | 2362 fps | 99.8% |
| Alliant Reloder-16 | 38.1 gr | 80% | 31,691 psi | 64% | 2234 fps | 96.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,447 psi | 72% | 2352 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,717 psi | 56% | 2162 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,215 psi | 71% | 2359 fps | 95.7% |
| Alliant Reloder-26 | 46.3 gr | 88% | 31,473 psi | 64% | 2313 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 40,770 psi | 83% | 2372 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 41,481 psi | 84% | 2349 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 41,365 psi | 84% | 2375 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 38,537 psi | 78% | 2372 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,269 psi | 59% | 2149 fps | 97% |
| Hodgdon Superformance | <<locked>> | 86% | 40,567 psi | 82% | 2438 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,818 psi | 54% | 1388 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 41,495 psi | 84% | 2372 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 37,985 psi | 77% | 2280 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 30,661 psi | 62% | 2188 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 35,447 psi | 72% | 2234 fps | 95.8% |
| Lovex S070 | <<locked>> | 84% | 38,218 psi | 78% | 2310 fps | 95.5% |
| Lovex S071 | <<locked>> | 98% | 35,128 psi | 71% | 2293 fps | 95.4% |
| Norma MRP | <<locked>> | 94% | 38,899 psi | 79% | 2451 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 31,807 psi | 65% | 2224 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 84% | 35,418 psi | 72% | 2313 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,340 psi | 55% | 1424 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,539 psi | 84% | 2356 fps | 96.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,710 psi | 76% | 2408 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,183 psi | 63% | 2238 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 33,344 psi | 68% | 2297 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 38,276 psi | 78% | 2320 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 41,481 psi | 84% | 2349 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,447 psi | 72% | 2234 fps | 95.8% |
| Shooters World SW4350 | <<locked>> | 84% | 38,218 psi | 78% | 2310 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,189 psi | 79% | 2365 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,408 psi | 82% | 2254 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 39,407 psi | 80% | 2280 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 39,001 psi | 79% | 2323 fps | 99.4% |
| Somchem S365 | 38.9 gr | 80% | 28,500 psi | 58% | 2185 fps | 98.1% |
| Vihtavuori N150 | <<locked>> | 80% | 37,072 psi | 75% | 2260 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 33,301 psi | 68% | 2231 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 80% | 32,677 psi | 66% | 2228 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 27,992 psi | 57% | 2178 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,663 psi | 66% | 2205 fps | 98.3% |
| Winchester 760 | <<locked>> | 84% | 38,537 psi | 78% | 2372 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,020 psi | 53% | 2178 fps | 95.3% |
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 46 powders for 7 x 57 R loaded with the .284 | 170gr | Geco PLUS. Norma MRP delivers the highest muzzle velocity at 2,566 fps; across all powders the maximum-charge window runs from 1,555 fps to 2,566 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 46 of the 46 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 170.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, 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 | 170gr | Geco PLUS 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.