Load Specifications
Load data in caliber 7 x 57 R with .284 | 150gr | Barnes X BT bullet and 39 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, 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 4064 | <<locked>> | 82% | 44,077 psi | 89% | 2516 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 41,756 psi | 85% | 2552 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 84% | 43,961 psi | 89% | 2513 fps | 98.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 44,425 psi | 90% | 2644 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 43,961 psi | 89% | 2539 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 82% | 44,338 psi | 90% | 2549 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 92% | 43,221 psi | 88% | 2598 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 88% | 43,352 psi | 88% | 2628 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,074 psi | 81% | 2562 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,367 psi | 90% | 2710 fps | 97.6% |
| Bofors RP3 | <<locked>> | 84% | 44,266 psi | 90% | 2552 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 82% | 42,264 psi | 86% | 2503 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,830 psi | 87% | 2549 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,810 psi | 73% | 1637 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 43,685 psi | 89% | 2497 fps | 98.5% |
| IMR 4831 | <<locked>> | 92% | 42,525 psi | 86% | 2549 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 44,063 psi | 89% | 2510 fps | 99.6% |
| Lovex S065 | <<locked>> | 88% | 43,366 psi | 88% | 2500 fps | 96.3% |
| Norma 203B | <<locked>> | 82% | 43,656 psi | 89% | 2539 fps | 98.8% |
| Norma URP | <<locked>> | 92% | 43,874 psi | 89% | 2592 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 82% | 43,134 psi | 87% | 2552 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,332 psi | 74% | 1677 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 43,163 psi | 88% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 43,830 psi | 89% | 2618 fps | 97.6% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 43,511 psi | 88% | 2621 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 86% | 44,411 psi | 90% | 2549 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 43,366 psi | 88% | 2500 fps | 96.3% |
| Shooters World Precision | <<locked>> | 82% | 44,063 psi | 89% | 2510 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 42,192 psi | 86% | 2543 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 43,671 psi | 89% | 2431 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 42,322 psi | 86% | 2500 fps | 98.9% |
| Somchem S365 | <<locked>> | 94% | 42,105 psi | 85% | 2602 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 86% | 42,815 psi | 87% | 2484 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 90% | 43,062 psi | 87% | 2539 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 82% | 44,222 psi | 90% | 2503 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 42,685 psi | 87% | 2549 fps | 97.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,700 psi | 89% | 2641 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 43,033 psi | 87% | 2520 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,042 psi | 73% | 2562 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% | 41,408 psi | 84% | 2470 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,664 psi | 70% | 2402 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 39,276 psi | 80% | 2421 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,684 psi | 85% | 2589 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,986 psi | 79% | 2444 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,872 psi | 85% | 2503 fps | 98.1% |
| Alliant Reloder-16 | 38.9 gr | 84% | 34,403 psi | 70% | 2398 fps | 95% |
| Alliant Reloder-17 | 39.9 gr | 80% | 33,808 psi | 69% | 2415 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,923 psi | 65% | 2365 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,914 psi | 79% | 2592 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 39,204 psi | 80% | 2457 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 80% | 39,697 psi | 81% | 2451 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,066 psi | 61% | 2260 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,832 psi | 54% | 1460 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,263 psi | 84% | 2451 fps | 98% |
| IMR 4831 | <<locked>> | 86% | 35,534 psi | 72% | 2408 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 41,336 psi | 84% | 2457 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 40,843 psi | 83% | 2451 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 41,278 psi | 84% | 2493 fps | 98.4% |
| Norma URP | <<locked>> | 84% | 34,534 psi | 70% | 2392 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 40,509 psi | 82% | 2503 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,398 psi | 56% | 1503 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,781 psi | 73% | 2477 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 36,260 psi | 74% | 2461 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 38,479 psi | 78% | 2513 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 37,115 psi | 75% | 2408 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,843 psi | 83% | 2451 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 41,336 psi | 84% | 2457 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,246 psi | 76% | 2441 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,798 psi | 79% | 2346 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 37,507 psi | 76% | 2405 fps | 98% |
| Somchem S365 | 37.9 gr | 80% | 27,963 psi | 57% | 2257 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 35,853 psi | 73% | 2349 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 36,027 psi | 73% | 2395 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 41,524 psi | 84% | 2454 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 35,433 psi | 72% | 2395 fps | 95% |
| Vihtavuori N555 | <<locked>> | 90% | 32,430 psi | 66% | 2395 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,734 psi | 64% | 2274 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,371 psi | 62% | 2388 fps | 95.2% |
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 39 powders for 7 x 57 R loaded with the .284 | 150gr | Barnes X BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,710 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,710 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 39 of the 39 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 150.0 gr projectile in 0.284" calls for a 1:10.5 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. Alliant Reloder-17, Alliant Reloder-16, Somchem S365 rank at the top here: for 7 x 57 R with the .284 | 150gr | Barnes X BT 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.