Load Specifications
Load data in caliber 7 x 57 R with .284 | 156gr | Lapua Naturalis bullet and 43 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 ReloadSwiss RS 62.
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 4064 | <<locked>> | 82% | 42,641 psi | 86% | 2461 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 43,381 psi | 88% | 2549 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 84% | 43,265 psi | 88% | 2464 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 43,511 psi | 88% | 2589 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 43,076 psi | 87% | 2487 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 82% | 43,439 psi | 88% | 2500 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,627 psi | 86% | 2552 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 42,366 psi | 86% | 2575 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,928 psi | 79% | 2507 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,337 psi | 88% | 2654 fps | 97.7% |
| Bofors RP3 | <<locked>> | 84% | 43,221 psi | 88% | 2500 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 84% | 43,830 psi | 89% | 2500 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 44,440 psi | 90% | 2543 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 44,005 psi | 89% | 2543 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,650 psi | 72% | 1604 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,873 psi | 87% | 2448 fps | 98.5% |
| IMR 4831 | <<locked>> | 94% | 44,034 psi | 89% | 2543 fps | 98.2% |
| IMR 4895 | <<locked>> | 82% | 44,454 psi | 90% | 2526 fps | 99.2% |
| Lovex S062 | <<locked>> | 82% | 42,757 psi | 87% | 2451 fps | 99.6% |
| Lovex S065 | <<locked>> | 88% | 42,250 psi | 86% | 2444 fps | 96.3% |
| Norma 203B | <<locked>> | 82% | 42,772 psi | 87% | 2490 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 42,931 psi | 87% | 2539 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 82% | 42,148 psi | 85% | 2500 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,143 psi | 73% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,063 psi | 89% | 2480 fps | 96% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 42,221 psi | 86% | 2579 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 42,569 psi | 86% | 2559 fps | 97.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,728 psi | 87% | 2572 fps | 97% |
| Rottweil R 903 | <<locked>> | 86% | 43,047 psi | 87% | 2490 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,250 psi | 86% | 2444 fps | 96.3% |
| Shooters World Precision | <<locked>> | 82% | 42,757 psi | 87% | 2451 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 44,005 psi | 89% | 2539 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,815 psi | 87% | 2379 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 43,816 psi | 89% | 2493 fps | 99.3% |
| Somchem S365 | <<locked>> | 96% | 43,685 psi | 89% | 2595 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 44,222 psi | 90% | 2444 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 44,570 psi | 90% | 2480 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 42,090 psi | 85% | 2487 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 82% | 43,105 psi | 87% | 2448 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 44,164 psi | 90% | 2539 fps | 97.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,380 psi | 86% | 2579 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,235 psi | 86% | 2470 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,128 psi | 71% | 2510 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 4064 | <<locked>> | 80% | 39,900 psi | 81% | 2411 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,243 psi | 67% | 2343 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 38,218 psi | 78% | 2365 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,756 psi | 83% | 2536 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,971 psi | 77% | 2392 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,930 psi | 83% | 2451 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,576 psi | 68% | 2349 fps | 95% |
| Alliant Reloder-17 | 39.4 gr | 80% | 32,953 psi | 67% | 2362 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,835 psi | 63% | 2310 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 37,695 psi | 76% | 2533 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 38,000 psi | 77% | 2402 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 80% | 38,682 psi | 78% | 2398 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,080 psi | 59% | 2208 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,176 psi | 84% | 2490 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,803 psi | 54% | 1437 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,132 psi | 81% | 2395 fps | 98% |
| IMR 4831 | <<locked>> | 86% | 34,360 psi | 70% | 2349 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 41,887 psi | 85% | 2480 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 40,321 psi | 82% | 2405 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 39,914 psi | 81% | 2398 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 40,335 psi | 82% | 2441 fps | 98.4% |
| Norma URP | <<locked>> | 84% | 33,576 psi | 68% | 2343 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 39,508 psi | 80% | 2451 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,079 psi | 55% | 1470 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,307 psi | 84% | 2428 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,940 psi | 71% | 2421 fps | 99.4% |
| ReloadSwiss RS 62 | 42.3 gr | 86% | 35,157 psi | 71% | 2405 fps | 95.3% |
| ReloadSwiss RS 70 | 44 gr | 88% | 37,565 psi | 76% | 2461 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 35,694 psi | 72% | 2346 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,914 psi | 81% | 2398 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 40,321 psi | 82% | 2405 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,376 psi | 74% | 2388 fps | 97.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,913 psi | 77% | 2293 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 36,463 psi | 74% | 2349 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 26,731 psi | 54% | 2195 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 41,597 psi | 84% | 2402 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,577 psi | 70% | 2290 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 34,925 psi | 71% | 2339 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 40,640 psi | 82% | 2405 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,490 psi | 70% | 2346 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 33,083 psi | 67% | 2385 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,763 psi | 62% | 2221 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,327 psi | 59% | 2333 fps | 95% |
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 43 powders for 7 x 57 R loaded with the .284 | 156gr | Lapua Naturalis. Alliant Reloder-26 delivers the highest muzzle velocity at 2,654 fps; across all powders the maximum-charge window runs from 1,604 fps to 2,654 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 43 of the 43 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 71–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.284" calls for a 1:10.0 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. ReloadSwiss RS 70, Alliant Reloder-17, ReloadSwiss RS 62 rank at the top here: for 7 x 57 R with the .284 | 156gr | Lapua Naturalis 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.