Load Specifications
Load data in caliber 7 x 57 R with .284 | 150gr | Prvi Partizan HP BT bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, Somchem S365 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% | 42,496 psi | 86% | 2487 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 42,888 psi | 87% | 2530 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 44,295 psi | 90% | 2628 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 86% | 44,483 psi | 90% | 2546 fps | 98.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,163 psi | 86% | 2625 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 44,266 psi | 90% | 2572 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 82% | 41,843 psi | 85% | 2533 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 94% | 43,642 psi | 89% | 2635 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 90% | 43,801 psi | 89% | 2664 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,536 psi | 76% | 2536 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,669 psi | 85% | 2680 fps | 97.1% |
| Bofors RP3 | <<locked>> | 86% | 44,063 psi | 89% | 2579 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 84% | 42,293 psi | 86% | 2533 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,018 psi | 87% | 2579 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 42,641 psi | 86% | 2579 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,491 psi | 72% | 1647 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 44,092 psi | 89% | 2533 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 42,424 psi | 86% | 2575 fps | 97.8% |
| IMR 4895 | <<locked>> | 82% | 42,830 psi | 87% | 2559 fps | 98.8% |
| Lovex S062 | <<locked>> | 84% | 43,990 psi | 89% | 2536 fps | 99.7% |
| Lovex S065 | <<locked>> | 90% | 43,120 psi | 87% | 2523 fps | 96.4% |
| Norma 203B | <<locked>> | 84% | 43,961 psi | 89% | 2572 fps | 99% |
| Norma URP | <<locked>> | 94% | 44,121 psi | 89% | 2621 fps | 98% |
| Ramshot Big Game | <<locked>> | 84% | 43,511 psi | 88% | 2585 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 94% | 43,250 psi | 88% | 2612 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,897 psi | 73% | 1686 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 44,005 psi | 89% | 2631 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 43,714 psi | 89% | 2671 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 43,961 psi | 89% | 2648 fps | 97.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 44,179 psi | 90% | 2661 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 82% | 43,265 psi | 88% | 2503 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 88% | 44,222 psi | 90% | 2575 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,120 psi | 87% | 2523 fps | 96.4% |
| Shooters World Precision | <<locked>> | 84% | 43,990 psi | 89% | 2536 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 42,467 psi | 86% | 2575 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 44,135 psi | 90% | 2464 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,018 psi | 85% | 2523 fps | 99% |
| Somchem S365 | <<locked>> | 96% | 42,322 psi | 86% | 2631 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 42,453 psi | 86% | 2480 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 43,366 psi | 88% | 2493 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,033 psi | 87% | 2513 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 92% | 43,569 psi | 88% | 2575 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 84% | 44,498 psi | 90% | 2533 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 42,598 psi | 86% | 2572 fps | 97.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,712 psi | 83% | 2608 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 43,729 psi | 89% | 2556 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,460 psi | 68% | 2520 fps | 97.4% |
| Winchester StaBALL Match | <<locked>> | 82% | 44,324 psi | 90% | 2572 fps | 99.4% |
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% | 39,972 psi | 81% | 2444 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,753 psi | 77% | 2438 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 33,562 psi | 68% | 2408 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 37,043 psi | 75% | 2402 fps | 96.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,508 psi | 80% | 2569 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,521 psi | 74% | 2421 fps | 98.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,146 psi | 79% | 2477 fps | 97.6% |
| Alliant Reloder-16 | 40.7 gr | 86% | 34,345 psi | 70% | 2428 fps | 95.2% |
| Alliant Reloder-17 | 40.7 gr | 80% | 31,401 psi | 64% | 2379 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,183 psi | 63% | 2379 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,260 psi | 74% | 2556 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 36,172 psi | 73% | 2425 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 80% | 37,028 psi | 75% | 2425 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,370 psi | 60% | 2274 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,871 psi | 81% | 2526 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,368 psi | 53% | 1470 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,841 psi | 79% | 2431 fps | 97.5% |
| IMR 4831 | <<locked>> | 88% | 34,867 psi | 71% | 2421 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 40,089 psi | 81% | 2507 fps | 98.3% |
| Lovex S062 | <<locked>> | 80% | 38,798 psi | 79% | 2438 fps | 99% |
| Lovex S065 | <<locked>> | 88% | 40,712 psi | 83% | 2477 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 38,551 psi | 78% | 2467 fps | 97.9% |
| Norma URP | <<locked>> | 86% | 34,214 psi | 69% | 2415 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 38,116 psi | 77% | 2480 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 40,567 psi | 82% | 2556 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,556 psi | 54% | 1503 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,031 psi | 83% | 2575 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,431 psi | 68% | 2444 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,955 psi | 73% | 2484 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 38,609 psi | 78% | 2543 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 40,495 psi | 82% | 2451 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 33,953 psi | 69% | 2369 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,712 psi | 83% | 2477 fps | 95.8% |
| Shooters World Precision | <<locked>> | 80% | 38,798 psi | 79% | 2438 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,882 psi | 71% | 2415 fps | 96.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,506 psi | 74% | 2329 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 34,896 psi | 71% | 2379 fps | 97.4% |
| Somchem S365 | 39.6 gr | 82% | 26,919 psi | 55% | 2260 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 39,914 psi | 81% | 2438 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,582 psi | 82% | 2448 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,098 psi | 67% | 2316 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 35,665 psi | 72% | 2415 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 39,102 psi | 79% | 2438 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 35,230 psi | 71% | 2421 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 94% | 33,402 psi | 68% | 2451 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,472 psi | 60% | 2241 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 98% | 31,401 psi | 64% | 2457 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,249 psi | 84% | 2513 fps | 98.9% |
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 48 powders for 7 x 57 R loaded with the .284 | 150gr | Prvi Partizan HP BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,680 fps; across all powders the maximum-charge window runs from 1,647 fps to 2,680 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 48 of the 48 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 68–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:11.5 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-16, Somchem S365, Alliant Reloder-17 rank at the top here: for 7 x 57 R with the .284 | 150gr | Prvi Partizan HP 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.