Load Specifications
Load data in caliber 7 x 57 R with .284 | 158gr | Prvi Partizan Grom bullet and 49 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 2495 | <<locked>> | 82% | 44,135 psi | 90% | 2441 fps | 100% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,480 psi | 82% | 2474 fps | 96% |
| Accurate 4064 | <<locked>> | 84% | 44,309 psi | 90% | 2484 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,946 psi | 87% | 2536 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 84% | 43,047 psi | 87% | 2454 fps | 98.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 43,511 psi | 88% | 2585 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,670 psi | 87% | 2477 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 82% | 43,033 psi | 87% | 2487 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,511 psi | 86% | 2549 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 88% | 42,496 psi | 86% | 2572 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,754 psi | 79% | 2500 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,279 psi | 88% | 2654 fps | 98.1% |
| Bofors RP3 | <<locked>> | 84% | 42,540 psi | 86% | 2484 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 84% | 43,613 psi | 88% | 2493 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 44,614 psi | 90% | 2539 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 44,048 psi | 89% | 2536 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,636 psi | 72% | 1601 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,612 psi | 86% | 2441 fps | 98.8% |
| IMR 4831 | <<locked>> | 94% | 44,048 psi | 89% | 2539 fps | 98.6% |
| IMR 4895 | <<locked>> | 82% | 44,106 psi | 89% | 2516 fps | 99.3% |
| Lovex S062 | <<locked>> | 82% | 42,583 psi | 86% | 2444 fps | 99.7% |
| Lovex S065 | <<locked>> | 90% | 44,440 psi | 90% | 2484 fps | 97.3% |
| Norma 203B | <<locked>> | 82% | 42,409 psi | 86% | 2477 fps | 99.1% |
| Norma URP | <<locked>> | 92% | 43,091 psi | 87% | 2536 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 82% | 42,105 psi | 85% | 2497 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 92% | 42,003 psi | 85% | 2523 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,085 psi | 73% | 1640 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,888 psi | 89% | 2474 fps | 96.4% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 42,351 psi | 86% | 2575 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 42,540 psi | 86% | 2556 fps | 98% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,670 psi | 87% | 2569 fps | 97.4% |
| Rottweil R 902 | <<locked>> | 82% | 44,382 psi | 90% | 2457 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 86% | 42,743 psi | 87% | 2480 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 44,440 psi | 90% | 2484 fps | 97.3% |
| Shooters World Precision | <<locked>> | 82% | 42,583 psi | 86% | 2444 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,947 psi | 89% | 2533 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,583 psi | 86% | 2369 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,309 psi | 90% | 2438 fps | 95.9% |
| Somchem S355 | <<locked>> | 86% | 43,569 psi | 88% | 2487 fps | 99.5% |
| Somchem S365 | <<locked>> | 96% | 43,758 psi | 89% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 43,947 psi | 89% | 2434 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 44,527 psi | 90% | 2444 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 44,411 psi | 90% | 2470 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 42,192 psi | 86% | 2484 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 82% | 42,931 psi | 87% | 2438 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 44,208 psi | 90% | 2536 fps | 98.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,308 psi | 86% | 2572 fps | 98.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,177 psi | 86% | 2467 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,621 psi | 70% | 2500 fps | 98.7% |
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% | 41,162 psi | 83% | 2395 fps | 100% |
| Accurate 3100 | <<locked>> | 98% | 37,681 psi | 76% | 2421 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 38,957 psi | 79% | 2392 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,721 psi | 66% | 2326 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 38,218 psi | 78% | 2362 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,698 psi | 83% | 2530 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,826 psi | 77% | 2385 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,538 psi | 82% | 2441 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,127 psi | 67% | 2339 fps | 95.4% |
| Alliant Reloder-17 | 40.3 gr | 80% | 32,619 psi | 66% | 2352 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,601 psi | 58% | 2251 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,157 psi | 71% | 2474 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 37,347 psi | 76% | 2385 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 80% | 38,145 psi | 77% | 2385 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,703 psi | 58% | 2201 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,176 psi | 84% | 2484 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 54% | 1427 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,132 psi | 81% | 2392 fps | 98.3% |
| IMR 4831 | <<locked>> | 84% | 31,734 psi | 64% | 2287 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 41,539 psi | 84% | 2470 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 39,827 psi | 81% | 2395 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 37,057 psi | 75% | 2339 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 39,914 psi | 81% | 2431 fps | 98.6% |
| Norma URP | <<locked>> | 84% | 33,257 psi | 67% | 2333 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 39,407 psi | 80% | 2444 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 39,378 psi | 80% | 2470 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,876 psi | 55% | 1463 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,133 psi | 83% | 2421 fps | 95.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,693 psi | 70% | 2418 fps | 99.6% |
| ReloadSwiss RS 62 | 43.2 gr | 86% | 34,722 psi | 70% | 2395 fps | 95.6% |
| ReloadSwiss RS 70 | 45 gr | 88% | 37,463 psi | 76% | 2457 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 41,771 psi | 85% | 2411 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 35,244 psi | 71% | 2336 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,057 psi | 75% | 2339 fps | 95.2% |
| Shooters World Precision | <<locked>> | 80% | 39,827 psi | 81% | 2395 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,984 psi | 73% | 2379 fps | 97.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,652 psi | 76% | 2287 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,379 psi | 84% | 2388 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 35,897 psi | 73% | 2336 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 26,194 psi | 53% | 2182 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 41,292 psi | 84% | 2392 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,930 psi | 85% | 2402 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,330 psi | 70% | 2283 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 84% | 34,664 psi | 70% | 2333 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 40,219 psi | 82% | 2392 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,127 psi | 69% | 2336 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 30,603 psi | 62% | 2320 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,313 psi | 61% | 2211 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,761 psi | 58% | 2323 fps | 95.5% |
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 49 powders for 7 x 57 R loaded with the .284 | 158gr | Prvi Partizan Grom. Alliant Reloder-26 delivers the highest muzzle velocity at 2,654 fps; across all powders the maximum-charge window runs from 1,601 fps to 2,654 fps. Accurate 3100 gives the best case fill at 100 %, and 49 of the 49 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 158.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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 | 158gr | Prvi Partizan Grom 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.