Load Specifications
Load data in caliber 7 x 57 R with .284 | 160gr | North Fork FPS bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and Alliant Reloder-26.
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% | 42,119 psi | 85% | 2482 fps | 96.5% |
| Accurate 4064 | <<locked>> | 82% | 42,279 psi | 86% | 2434 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 43,598 psi | 88% | 2533 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 84% | 43,569 psi | 88% | 2460 fps | 98.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 44,063 psi | 89% | 2594 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 43,236 psi | 88% | 2481 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 82% | 43,598 psi | 88% | 2493 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 92% | 43,033 psi | 87% | 2554 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 88% | 43,047 psi | 87% | 2579 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,350 psi | 82% | 2510 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 42,090 psi | 85% | 2605 fps | 97.9% |
| Bofors RP3 | <<locked>> | 84% | 43,134 psi | 87% | 2489 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 84% | 44,164 psi | 90% | 2497 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,264 psi | 86% | 2494 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 42,018 psi | 85% | 2487 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,318 psi | 74% | 1597 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 43,149 psi | 88% | 2448 fps | 99.5% |
| IMR 3031 | <<locked>> | 82% | 44,614 psi | 90% | 2490 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 42,844 psi | 87% | 2431 fps | 98.9% |
| IMR 4831 | <<locked>> | 96% | 42,612 psi | 86% | 2510 fps | 98.5% |
| Lovex S062 | <<locked>> | 82% | 43,134 psi | 87% | 2448 fps | 99.8% |
| Lovex S065 | <<locked>> | 88% | 42,453 psi | 86% | 2444 fps | 97.1% |
| Lovex S070 | <<locked>> | 90% | 42,888 psi | 87% | 2471 fps | 96.1% |
| Norma 203B | <<locked>> | 82% | 42,975 psi | 87% | 2483 fps | 99.3% |
| Norma MRPᴾ | <<locked>> | 100% | 44,498 psi | 90% | 2623 fps | 95.9% |
| Norma URP | <<locked>> | 92% | 43,685 psi | 89% | 2542 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 82% | 42,685 psi | 87% | 2500 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 92% | 42,569 psi | 86% | 2530 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,289 psi | 74% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,411 psi | 90% | 2480 fps | 96.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 42,902 psi | 87% | 2582 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 43,497 psi | 88% | 2567 fps | 98.4% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 43,178 psi | 88% | 2578 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 86% | 43,337 psi | 88% | 2486 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,453 psi | 86% | 2444 fps | 97.1% |
| Shooters World Precision | <<locked>> | 82% | 43,134 psi | 87% | 2448 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 90% | 42,888 psi | 87% | 2461 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 44,527 psi | 90% | 2538 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 43,105 psi | 87% | 2372 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 44,135 psi | 90% | 2491 fps | 99.6% |
| Somchem S365 | <<locked>> | 96% | 44,382 psi | 90% | 2593 fps | 100% |
| Unknown powder | <<locked>> | 90% | 44,512 psi | 90% | 2546 fps | 98.2% |
| Vihtavuori N135 | <<locked>> | 82% | 44,556 psi | 90% | 2428 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 44,585 psi | 90% | 2442 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 42,366 psi | 86% | 2433 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 88% | 41,843 psi | 85% | 2471 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 82% | 44,222 psi | 90% | 2462 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 42,134 psi | 85% | 2510 fps | 98.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,208 psi | 90% | 2580 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,656 psi | 87% | 2471 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,447 psi | 72% | 2521 fps | 99.2% |
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% | 38,319 psi | 78% | 2429 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 39,537 psi | 80% | 2388 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,257 psi | 67% | 2326 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 38,406 psi | 78% | 2362 fps | 97.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,220 psi | 84% | 2538 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,087 psi | 77% | 2384 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,075 psi | 83% | 2446 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,604 psi | 64% | 2297 fps | 95.1% |
| Alliant Reloder-17 | 40.4 gr | 80% | 33,054 psi | 67% | 2364 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,979 psi | 59% | 2259 fps | 95.6% |
| Alliant Reloder-26 | 48.6 gr | 94% | 35,621 psi | 72% | 2484 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 37,898 psi | 77% | 2392 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 80% | 38,653 psi | 78% | 2394 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,195 psi | 55% | 2155 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,262 psi | 80% | 2434 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,614 psi | 54% | 1427 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,611 psi | 82% | 2398 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 41,872 psi | 85% | 2445 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,739 psi | 77% | 2333 fps | 97.9% |
| IMR 4831 | <<locked>> | 86% | 31,154 psi | 63% | 2270 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 40,350 psi | 82% | 2398 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,521 psi | 76% | 2346 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 40,422 psi | 82% | 2424 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 40,451 psi | 82% | 2435 fps | 98.9% |
| Norma MRP | <<locked>> | 98% | 42,351 psi | 86% | 2566 fps | 95% |
| Norma URP | <<locked>> | 84% | 33,736 psi | 68% | 2341 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 39,943 psi | 81% | 2449 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 37,376 psi | 76% | 2424 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,847 psi | 54% | 1459 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,001 psi | 79% | 2376 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,157 psi | 71% | 2424 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,938 psi | 67% | 2350 fps | 95.3% |
| ReloadSwiss RS 70 | 44.1 gr | 86% | 35,549 psi | 72% | 2411 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 35,781 psi | 73% | 2342 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,521 psi | 76% | 2346 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 40,350 psi | 82% | 2398 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 40,422 psi | 82% | 2415 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,492 psi | 74% | 2385 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,145 psi | 77% | 2289 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 36,390 psi | 74% | 2343 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 26,556 psi | 54% | 2193 fps | 96.4% |
| Unknown powder | <<locked>> | 82% | 34,200 psi | 69% | 2338 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 41,887 psi | 85% | 2385 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,727 psi | 85% | 2395 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,169 psi | 63% | 2210 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 80% | 32,140 psi | 65% | 2268 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 41,437 psi | 84% | 2415 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,474 psi | 66% | 2305 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 90% | 31,082 psi | 63% | 2329 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,690 psi | 62% | 2218 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,109 psi | 59% | 2338 fps | 96.3% |
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 80 powders for 7 x 57 R loaded with the .284 | 160gr | North Fork FPS. Norma MRP delivers the highest muzzle velocity at 2,623 fps; across all powders the maximum-charge window runs from 1,597 fps to 2,623 fps. Accurate 3100 gives the best case fill at 100 %, and 80 of the 80 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 70–90 %, 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, ADI AR 2213, Alliant Reloder-22 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. ReloadSwiss RS 70, Alliant Reloder-17, Alliant Reloder-26 rank at the top here: for 7 x 57 R with the .284 | 160gr | North Fork FPS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, ADI AR 2209, ADI AR 2213 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.