Load Specifications
Load data in caliber 7 x 57 R with .284 | 155gr | Geco EXPRESS bullet and 49 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% | 43,468 psi | 88% | 2457 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 43,874 psi | 89% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,453 psi | 86% | 2552 fps | 98% |
| ADI AR 2208 | <<locked>> | 84% | 42,482 psi | 86% | 2470 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,844 psi | 87% | 2598 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,337 psi | 86% | 2493 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,714 psi | 87% | 2507 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 92% | 41,858 psi | 85% | 2559 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 41,785 psi | 85% | 2582 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,305 psi | 78% | 2516 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,424 psi | 86% | 2657 fps | 97.7% |
| Bofors RP3 | <<locked>> | 84% | 42,148 psi | 85% | 2503 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 84% | 42,975 psi | 87% | 2507 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,859 psi | 89% | 2549 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 43,323 psi | 88% | 2549 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,404 psi | 72% | 1617 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,061 psi | 85% | 2454 fps | 98.5% |
| IMR 4831 | <<locked>> | 94% | 43,613 psi | 88% | 2556 fps | 98.3% |
| IMR 4895 | <<locked>> | 82% | 43,772 psi | 89% | 2536 fps | 99.2% |
| Lovex S062 | <<locked>> | 84% | 44,570 psi | 90% | 2503 fps | 99.8% |
| Lovex S065 | <<locked>> | 90% | 44,077 psi | 89% | 2500 fps | 97% |
| Lovex S070 | <<locked>> | 92% | 44,498 psi | 90% | 2526 fps | 96% |
| Norma 203B | <<locked>> | 82% | 42,047 psi | 85% | 2497 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 42,337 psi | 86% | 2546 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 84% | 44,599 psi | 90% | 2562 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 94% | 44,092 psi | 89% | 2585 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,853 psi | 73% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,526 psi | 88% | 2490 fps | 96.1% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 44,556 psi | 90% | 2641 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 42,003 psi | 85% | 2569 fps | 97.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,235 psi | 86% | 2582 fps | 97.1% |
| Rottweil R 902 | <<locked>> | 82% | 44,077 psi | 89% | 2474 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 86% | 42,018 psi | 85% | 2493 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 44,077 psi | 89% | 2500 fps | 97% |
| Shooters World Precision | <<locked>> | 84% | 44,570 psi | 90% | 2503 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 92% | 44,498 psi | 90% | 2526 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,265 psi | 88% | 2546 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,032 psi | 85% | 2385 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,931 psi | 87% | 2500 fps | 99.3% |
| Somchem S365 | <<locked>> | 96% | 43,221 psi | 88% | 2605 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 43,337 psi | 88% | 2451 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 43,932 psi | 89% | 2461 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,743 psi | 89% | 2484 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 92% | 44,411 psi | 90% | 2546 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 82% | 42,337 psi | 86% | 2454 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,482 psi | 88% | 2549 fps | 97.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,742 psi | 85% | 2585 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 44,527 psi | 90% | 2530 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,185 psi | 69% | 2507 fps | 98.3% |
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 2495 | <<locked>> | 80% | 40,828 psi | 83% | 2415 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,624 psi | 78% | 2411 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,519 psi | 70% | 2392 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 37,710 psi | 76% | 2375 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,074 psi | 81% | 2543 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,275 psi | 76% | 2395 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,958 psi | 81% | 2454 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,851 psi | 67% | 2352 fps | 95% |
| Alliant Reloder-17 | 40.4 gr | 80% | 32,140 psi | 65% | 2362 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,994 psi | 61% | 2310 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 96% | 37,086 psi | 75% | 2539 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 36,767 psi | 75% | 2398 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 80% | 37,550 psi | 76% | 2398 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,253 psi | 57% | 2208 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,524 psi | 82% | 2497 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,484 psi | 54% | 1444 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,595 psi | 80% | 2405 fps | 98% |
| IMR 4831 | <<locked>> | 86% | 33,402 psi | 68% | 2349 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 40,915 psi | 83% | 2484 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 39,566 psi | 80% | 2411 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 38,986 psi | 79% | 2402 fps | 95.6% |
| Lovex S070 | <<locked>> | 90% | 41,669 psi | 85% | 2474 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 39,320 psi | 80% | 2441 fps | 98.4% |
| Norma URP | <<locked>> | 86% | 34,795 psi | 71% | 2392 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 38,769 psi | 79% | 2454 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 92% | 41,321 psi | 84% | 2533 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,687 psi | 54% | 1476 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,814 psi | 83% | 2438 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,185 psi | 69% | 2425 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,345 psi | 70% | 2408 fps | 95.2% |
| ReloadSwiss RS 70 | 45.1 gr | 88% | 36,825 psi | 75% | 2464 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 41,220 psi | 84% | 2425 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 34,693 psi | 70% | 2346 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,986 psi | 79% | 2402 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 39,566 psi | 80% | 2411 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 41,669 psi | 85% | 2474 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,650 psi | 72% | 2392 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,188 psi | 75% | 2300 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,636 psi | 72% | 2352 fps | 97.9% |
| Somchem S365 | 38.3 gr | 80% | 25,788 psi | 52% | 2192 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 40,698 psi | 83% | 2408 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,365 psi | 84% | 2418 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,794 psi | 69% | 2293 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 34,113 psi | 69% | 2343 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 39,682 psi | 80% | 2405 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 35,897 psi | 73% | 2398 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 92% | 32,126 psi | 65% | 2382 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,878 psi | 61% | 2218 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,095 psi | 61% | 2385 fps | 96% |
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 49 powders for 7 x 57 R loaded with the .284 | 155gr | Geco EXPRESS. Alliant Reloder-26 delivers the highest muzzle velocity at 2,657 fps; across all powders the maximum-charge window runs from 1,617 fps to 2,657 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 49 of the 49 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.284" calls for a 1:11.0 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 | 155gr | Geco EXPRESS 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.