Load Specifications
Load data in caliber 7 x 57 with .284 | 158gr | Prvi Partizan Grom bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Alliant Reloder-16.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 50,778 psi | 90% | 2546 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 50,082 psi | 89% | 2543 fps | 96.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 41,176 psi | 73% | 2497 fps | 96.3% |
| Accurate 4064 | <<locked>> | 88% | 51,053 psi | 90% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 50,140 psi | 89% | 2664 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 82% | 48,283 psi | 85% | 2569 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 88% | 49,414 psi | 87% | 2575 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 50,459 psi | 89% | 2572 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 51,155 psi | 90% | 2552 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 50,604 psi | 89% | 2723 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 49,095 psi | 87% | 2592 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 49,487 psi | 87% | 2608 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 96% | 48,617 psi | 86% | 2671 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 92% | 49,327 psi | 87% | 2703 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,378 psi | 70% | 2526 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,092 psi | 78% | 2680 fps | 98.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 50,879 psi | 90% | 2631 fps | 99.5% |
| Bofors RP3 | <<locked>> | 88% | 49,443 psi | 87% | 2608 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 49,951 psi | 88% | 2579 fps | 96.7% |
| Hodgdon BL-C2 | <<locked>> | 82% | 49,443 psi | 87% | 2598 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 50,430 psi | 89% | 2618 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 94% | 49,922 psi | 88% | 2664 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 92% | 50,749 psi | 90% | 2631 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 82% | 48,747 psi | 86% | 2579 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 48,312 psi | 85% | 2608 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 50,995 psi | 90% | 2657 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 50,111 psi | 89% | 2694 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,650 psi | 63% | 1614 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 49,661 psi | 88% | 2579 fps | 99.9% |
| IMR 3031 | <<locked>> | 82% | 48,472 psi | 86% | 2566 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 48,747 psi | 86% | 2556 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 84% | 48,747 psi | 86% | 2533 fps | 97% |
| IMR 4350 | <<locked>> | 96% | 49,966 psi | 88% | 2605 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 48,602 psi | 86% | 2559 fps | 96.8% |
| IMR 4831 | <<locked>> | 98% | 50,952 psi | 90% | 2661 fps | 99.5% |
| IMR 4895 | <<locked>> | 86% | 50,691 psi | 90% | 2638 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 82% | 50,459 psi | 89% | 2572 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 50,850 psi | 90% | 2595 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 48,095 psi | 85% | 2507 fps | 99.7% |
| Lovex S062 | <<locked>> | 86% | 48,675 psi | 86% | 2556 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 51,097 psi | 90% | 2605 fps | 98.6% |
| Lovex S070 | <<locked>> | 94% | 48,762 psi | 86% | 2589 fps | 97.3% |
| Norma 201 | <<locked>> | 84% | 50,343 psi | 89% | 2569 fps | 100% |
| Norma 202 | <<locked>> | 84% | 50,734 psi | 90% | 2572 fps | 100% |
| Norma 203B | <<locked>> | 86% | 48,718 psi | 86% | 2595 fps | 99.8% |
| Norma URP | <<locked>> | 96% | 49,574 psi | 88% | 2654 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 86% | 48,994 psi | 87% | 2621 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 96% | 48,588 psi | 86% | 2654 fps | 97.9% |
| Ramshot TAC | <<locked>> | 82% | 50,343 psi | 89% | 2585 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 49,937 psi | 88% | 2602 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,114 psi | 64% | 1650 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 50,749 psi | 90% | 2602 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 49,632 psi | 88% | 2667 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 49,240 psi | 87% | 2707 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 49,951 psi | 88% | 2687 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 49,603 psi | 88% | 2707 fps | 99% |
| Rottweil R 902 | <<locked>> | 86% | 50,691 psi | 90% | 2566 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 49,284 psi | 87% | 2598 fps | 100% |
| Rottweil R 907 | <<locked>> | 92% | 49,951 psi | 88% | 2579 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 94% | 51,097 psi | 90% | 2605 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 50,850 psi | 90% | 2595 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 48,675 psi | 86% | 2556 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 48,762 psi | 86% | 2589 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 50,720 psi | 90% | 2654 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 48,805 psi | 86% | 2562 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 49,734 psi | 88% | 2592 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 48,573 psi | 86% | 2470 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 48,834 psi | 86% | 2474 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 51,155 psi | 90% | 2559 fps | 97.4% |
| Somchem S335 | <<locked>> | 82% | 48,095 psi | 85% | 2470 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 48,356 psi | 85% | 2556 fps | 99.7% |
| Somchem S355 | <<locked>> | 90% | 49,705 psi | 88% | 2598 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,720 psi | 90% | 2707 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 47,210 psi | 83% | 2595 fps | 96.1% |
| Vihtavuori N133 | <<locked>> | 82% | 48,921 psi | 86% | 2461 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 50,618 psi | 89% | 2539 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 47,993 psi | 85% | 2507 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 51,068 psi | 90% | 2582 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 48,863 psi | 86% | 2608 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 82% | 50,618 psi | 89% | 2569 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 49,501 psi | 88% | 2549 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 51,184 psi | 90% | 2661 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,105 psi | 76% | 2595 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 48,878 psi | 86% | 2589 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 50,633 psi | 90% | 2615 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 49,922 psi | 88% | 2664 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,302 psi | 62% | 2530 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 84% | 49,429 psi | 87% | 2598 fps | 99.9% |
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% | 42,018 psi | 74% | 2418 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 47,007 psi | 83% | 2493 fps | 95.7% |
| Accurate 3100 | <<locked>> | 98% | 38,377 psi | 68% | 2444 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 39,755 psi | 70% | 2415 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 33,373 psi | 59% | 2352 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 45,281 psi | 80% | 2520 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 38,653 psi | 68% | 2382 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,340 psi | 84% | 2523 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,747 psi | 84% | 2507 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 41,321 psi | 73% | 2552 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,290 psi | 68% | 2402 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,002 psi | 72% | 2461 fps | 98.5% |
| Alliant Reloder-16 | 40 gr | 84% | 33,678 psi | 60% | 2362 fps | 95.8% |
| Alliant Reloder-17 | 41 gr | 80% | 32,909 psi | 58% | 2372 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,979 psi | 51% | 2270 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,679 psi | 63% | 2497 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,527 psi | 79% | 2526 fps | 98.7% |
| Bofors RP3 | <<locked>> | 80% | 37,797 psi | 67% | 2405 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 43,918 psi | 78% | 2477 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,383 psi | 82% | 2549 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,798 psi | 69% | 2411 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 88% | 40,683 psi | 72% | 2500 fps | 95% |
| Hodgdon H4350 | <<locked>> | 90% | 47,587 psi | 84% | 2579 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 45,701 psi | 81% | 2530 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,037 psi | 51% | 2218 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,887 psi | 74% | 2507 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 90% | 43,395 psi | 77% | 2572 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,571 psi | 47% | 1440 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,903 psi | 78% | 2487 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 45,527 psi | 80% | 2520 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,567 psi | 72% | 2411 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,946 psi | 76% | 2431 fps | 95.5% |
| IMR 4350 | <<locked>> | 92% | 44,005 psi | 78% | 2503 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,859 psi | 76% | 2457 fps | 95.4% |
| IMR 4831 | <<locked>> | 84% | 32,343 psi | 57% | 2310 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 42,018 psi | 74% | 2490 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 47,340 psi | 84% | 2523 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,556 psi | 79% | 2500 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,411 psi | 80% | 2461 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 40,596 psi | 72% | 2418 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,666 psi | 67% | 2362 fps | 95.5% |
| Lovex S070 | <<locked>> | 88% | 40,466 psi | 72% | 2438 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 44,541 psi | 79% | 2477 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 44,802 psi | 79% | 2480 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,379 psi | 71% | 2451 fps | 98.8% |
| Norma URP | <<locked>> | 84% | 33,634 psi | 59% | 2352 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 40,001 psi | 71% | 2464 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 39,827 psi | 70% | 2490 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 47,311 psi | 84% | 2536 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,833 psi | 83% | 2552 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,789 psi | 47% | 1470 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,146 psi | 69% | 2395 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,279 psi | 77% | 2559 fps | 98.9% |
| ReloadSwiss RS 60 | 41 gr | 80% | 35,041 psi | 62% | 2434 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,982 psi | 58% | 2362 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,476 psi | 63% | 2421 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 42,279 psi | 75% | 2428 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 35,708 psi | 63% | 2356 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 43,918 psi | 78% | 2477 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,666 psi | 67% | 2362 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,556 psi | 79% | 2500 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,596 psi | 72% | 2418 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 40,466 psi | 72% | 2438 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,593 psi | 65% | 2402 fps | 97.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,687 psi | 81% | 2513 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,801 psi | 77% | 2490 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,788 psi | 81% | 2428 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,130 psi | 67% | 2303 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,930 psi | 74% | 2408 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 45,440 psi | 80% | 2428 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,339 psi | 80% | 2507 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 36,608 psi | 65% | 2362 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 26,513 psi | 47% | 2201 fps | 96.1% |
| Somchem S385 | <<locked>> | 98% | 44,193 psi | 78% | 2543 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 46,122 psi | 82% | 2418 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,872 psi | 74% | 2411 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,395 psi | 75% | 2421 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,722 psi | 61% | 2300 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 32,982 psi | 58% | 2303 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 47,369 psi | 84% | 2520 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,886 psi | 72% | 2415 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,693 psi | 61% | 2359 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 90% | 31,096 psi | 55% | 2343 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,719 psi | 54% | 2231 fps | 96.6% |
| Winchester 748 | <<locked>> | 80% | 47,123 psi | 83% | 2562 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 40,988 psi | 72% | 2503 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,196 psi | 52% | 2349 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,178 psi | 76% | 2493 fps | 99.5% |
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 107 powders for 7 x 57 loaded with the .284 | 158gr | Prvi Partizan Grom. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,723 fps; across all powders the maximum-charge window runs from 1,614 fps to 2,723 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (390 MPa), the top charges use 60–90 %, 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, ADI AR 2209, Alliant Reloder-19 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 60, Alliant Reloder-17, Alliant Reloder-16 rank at the top here: for 7 x 57 with the .284 | 158gr | Prvi Partizan Grom they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-22, Alliant Reloder-25, Bofors RP15 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.