Load Specifications
Load data in caliber 7 x 57 R with .284 | 160gr | NorthFork Bonded Core bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Alliant Reloder-17 and ReloadSwiss RS 70.
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% | 43,279 psi | 88% | 2405 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 43,511 psi | 88% | 2448 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,163 psi | 86% | 2497 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 84% | 42,409 psi | 86% | 2418 fps | 98.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,685 psi | 87% | 2546 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,018 psi | 85% | 2441 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,366 psi | 86% | 2451 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 94% | 44,106 psi | 89% | 2552 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 90% | 44,512 psi | 90% | 2585 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,043 psi | 77% | 2464 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,206 psi | 86% | 2605 fps | 97.8% |
| Bofors RP3 | <<locked>> | 84% | 41,916 psi | 85% | 2451 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 84% | 42,757 psi | 87% | 2451 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,584 psi | 88% | 2497 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 43,120 psi | 87% | 2497 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,462 psi | 72% | 1578 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 44,585 psi | 90% | 2451 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 82% | 44,556 psi | 90% | 2421 fps | 95.8% |
| IMR 4831 | <<locked>> | 94% | 43,076 psi | 87% | 2500 fps | 98.3% |
| IMR 4895 | <<locked>> | 82% | 43,381 psi | 88% | 2477 fps | 99.2% |
| Lovex S062 | <<locked>> | 84% | 44,454 psi | 90% | 2451 fps | 99.8% |
| Lovex S065 | <<locked>> | 90% | 43,685 psi | 89% | 2444 fps | 97.1% |
| Lovex S070 | <<locked>> | 92% | 44,193 psi | 90% | 2474 fps | 96% |
| Norma 203B | <<locked>> | 84% | 44,338 psi | 90% | 2487 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 42,032 psi | 85% | 2493 fps | 98% |
| Ramshot Big Game | <<locked>> | 84% | 44,193 psi | 90% | 2507 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 94% | 43,758 psi | 89% | 2530 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,911 psi | 73% | 1614 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,105 psi | 87% | 2434 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 44,512 psi | 90% | 2546 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 44,280 psi | 90% | 2585 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,655 psi | 84% | 2513 fps | 97.7% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 44,585 psi | 90% | 2579 fps | 97.8% |
| Rottweil R 902 | <<locked>> | 82% | 43,598 psi | 88% | 2418 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 86% | 41,785 psi | 85% | 2441 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,685 psi | 89% | 2444 fps | 97.1% |
| Shooters World Precision | <<locked>> | 84% | 44,454 psi | 90% | 2451 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 92% | 44,193 psi | 90% | 2474 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,149 psi | 88% | 2493 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 44,585 psi | 90% | 2379 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,641 psi | 86% | 2444 fps | 99.3% |
| Somchem S365 | <<locked>> | 96% | 42,815 psi | 87% | 2549 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 43,062 psi | 87% | 2395 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 43,816 psi | 89% | 2408 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,569 psi | 88% | 2431 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 92% | 44,150 psi | 90% | 2493 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 82% | 42,061 psi | 85% | 2398 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,279 psi | 88% | 2497 fps | 98% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,365 psi | 84% | 2533 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 43,990 psi | 89% | 2474 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,866 psi | 69% | 2454 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% | 40,582 psi | 82% | 2362 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,421 psi | 78% | 2359 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,287 psi | 70% | 2343 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 37,507 psi | 76% | 2323 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,871 psi | 81% | 2487 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,130 psi | 75% | 2346 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,827 psi | 81% | 2402 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,576 psi | 66% | 2300 fps | 95.1% |
| Alliant Reloder-17 | 39.1 gr | 80% | 31,923 psi | 65% | 2313 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,733 psi | 60% | 2260 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,738 psi | 75% | 2484 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 36,651 psi | 74% | 2349 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 80% | 37,492 psi | 76% | 2349 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,152 psi | 57% | 2162 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,205 psi | 82% | 2441 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,513 psi | 54% | 1411 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,378 psi | 80% | 2356 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,669 psi | 85% | 2369 fps | 95% |
| IMR 4831 | <<locked>> | 86% | 33,199 psi | 67% | 2300 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 40,799 psi | 83% | 2431 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 39,349 psi | 80% | 2359 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 38,740 psi | 79% | 2352 fps | 95.7% |
| Lovex S070 | <<locked>> | 90% | 41,597 psi | 84% | 2425 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 39,218 psi | 80% | 2392 fps | 98.5% |
| Norma URP | <<locked>> | 86% | 34,548 psi | 70% | 2339 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 38,537 psi | 78% | 2402 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 38,537 psi | 78% | 2428 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,745 psi | 54% | 1444 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,335 psi | 82% | 2382 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,713 psi | 85% | 2497 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,953 psi | 69% | 2375 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,040 psi | 69% | 2356 fps | 95.3% |
| ReloadSwiss RS 70 | 43.7 gr | 88% | 36,724 psi | 74% | 2415 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 41,002 psi | 83% | 2369 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 34,519 psi | 70% | 2297 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,740 psi | 79% | 2352 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 39,349 psi | 80% | 2359 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 41,597 psi | 84% | 2425 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,375 psi | 72% | 2343 fps | 97.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,883 psi | 75% | 2247 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,404 psi | 72% | 2303 fps | 98% |
| Somchem S365 | 37.1 gr | 80% | 25,672 psi | 52% | 2146 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 40,364 psi | 82% | 2352 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,205 psi | 84% | 2365 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,649 psi | 68% | 2244 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 33,866 psi | 69% | 2290 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 39,566 psi | 80% | 2356 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,388 psi | 68% | 2297 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 31,821 psi | 65% | 2329 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,747 psi | 60% | 2172 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,892 psi | 61% | 2336 fps | 96.2% |
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 76 powders for 7 x 57 R loaded with the .284 | 160gr | NorthFork Bonded Core. Alliant Reloder-26 delivers the highest muzzle velocity at 2,605 fps; across all powders the maximum-charge window runs from 1,578 fps to 2,605 fps. Accurate 3100 gives the best case fill at 100 %, and 76 of the 76 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 66–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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, Alliant Reloder-17, ReloadSwiss RS 70 rank at the top here: for 7 x 57 R with the .284 | 160gr | NorthFork Bonded Core they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, ADI AR 2209, Alliant Reloder-19 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.