Load Specifications
Load data in caliber 7 x 57 R with .284 | 145gr | Speer Boat-Tail bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, ReloadSwiss RS 70 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% | 42,946 psi | 87% | 2549 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 43,250 psi | 88% | 2592 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 41,800 psi | 85% | 2635 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 84% | 42,235 psi | 86% | 2559 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,525 psi | 86% | 2687 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 44,498 psi | 90% | 2631 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,163 psi | 86% | 2592 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 94% | 44,092 psi | 89% | 2697 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 90% | 44,179 psi | 90% | 2726 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,739 psi | 77% | 2592 fps | 98% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,090 psi | 85% | 2743 fps | 97.1% |
| Bofors RP3 | <<locked>> | 86% | 44,483 psi | 90% | 2641 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 84% | 42,453 psi | 86% | 2589 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,439 psi | 88% | 2638 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 42,830 psi | 87% | 2638 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,302 psi | 72% | 1686 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 44,411 psi | 90% | 2592 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 42,859 psi | 87% | 2638 fps | 97.8% |
| IMR 4895 | <<locked>> | 82% | 43,178 psi | 88% | 2621 fps | 98.8% |
| Lovex S062 | <<locked>> | 84% | 44,280 psi | 90% | 2595 fps | 99.6% |
| Lovex S065 | <<locked>> | 90% | 43,468 psi | 88% | 2582 fps | 96.4% |
| Norma 203B | <<locked>> | 84% | 44,208 psi | 90% | 2631 fps | 98.9% |
| Norma URP | <<locked>> | 94% | 44,599 psi | 90% | 2684 fps | 98% |
| Ramshot Big Game | <<locked>> | 84% | 44,063 psi | 89% | 2651 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 94% | 43,758 psi | 89% | 2674 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,955 psi | 73% | 1732 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 44,280 psi | 90% | 2690 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 44,193 psi | 90% | 2736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 44,512 psi | 90% | 2710 fps | 97.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 44,570 psi | 90% | 2723 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 82% | 43,381 psi | 88% | 2559 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 88% | 44,367 psi | 90% | 2631 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,468 psi | 88% | 2582 fps | 96.4% |
| Shooters World Precision | <<locked>> | 84% | 44,280 psi | 90% | 2595 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 42,844 psi | 87% | 2635 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 44,483 psi | 90% | 2523 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,496 psi | 86% | 2585 fps | 99% |
| Somchem S365 | <<locked>> | 96% | 42,699 psi | 87% | 2690 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 43,018 psi | 87% | 2546 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 43,685 psi | 89% | 2556 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,134 psi | 87% | 2569 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 92% | 43,772 psi | 89% | 2631 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 82% | 41,959 psi | 85% | 2543 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,004 psi | 87% | 2635 fps | 97.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,220 psi | 84% | 2671 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 43,859 psi | 89% | 2612 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,881 psi | 69% | 2579 fps | 97.4% |
| Winchester StaBALL Match | <<locked>> | 82% | 44,512 psi | 90% | 2628 fps | 99.3% |
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 2495 | <<locked>> | 80% | 40,190 psi | 82% | 2500 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,985 psi | 77% | 2493 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 36,405 psi | 74% | 2523 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 37,217 psi | 75% | 2454 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,639 psi | 80% | 2625 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,695 psi | 74% | 2474 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,552 psi | 80% | 2536 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,548 psi | 70% | 2480 fps | 95.1% |
| Alliant Reloder-17 | 42.2 gr | 80% | 31,792 psi | 64% | 2438 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,517 psi | 64% | 2434 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 39,160 psi | 79% | 2677 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 36,274 psi | 74% | 2477 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 80% | 37,318 psi | 76% | 2484 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,617 psi | 60% | 2329 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,132 psi | 81% | 2585 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 53% | 1506 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,059 psi | 79% | 2490 fps | 97.5% |
| IMR 4831 | <<locked>> | 88% | 35,186 psi | 71% | 2477 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 40,495 psi | 82% | 2569 fps | 98.3% |
| Lovex S062 | <<locked>> | 80% | 39,015 psi | 79% | 2493 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 41,104 psi | 83% | 2536 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 38,914 psi | 79% | 2526 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 36,666 psi | 74% | 2523 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 38,319 psi | 78% | 2536 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 92% | 40,872 psi | 83% | 2615 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 54% | 1545 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,365 psi | 84% | 2635 fps | 97.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,881 psi | 69% | 2507 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,158 psi | 73% | 2536 fps | 95.3% |
| ReloadSwiss RS 70 | 48.2 gr | 90% | 39,102 psi | 79% | 2605 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 40,973 psi | 83% | 2513 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 34,316 psi | 70% | 2428 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,104 psi | 83% | 2536 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 39,015 psi | 79% | 2493 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,143 psi | 71% | 2470 fps | 96.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,796 psi | 75% | 2385 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,085 psi | 71% | 2431 fps | 97.3% |
| Somchem S365 | 41 gr | 82% | 27,166 psi | 55% | 2313 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 40,205 psi | 82% | 2497 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,944 psi | 83% | 2507 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,475 psi | 68% | 2375 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 36,027 psi | 73% | 2474 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 39,421 psi | 80% | 2493 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 35,346 psi | 72% | 2470 fps | 95% |
| Vihtavuori N555 | <<locked>> | 94% | 33,794 psi | 69% | 2507 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,733 psi | 60% | 2293 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 31,662 psi | 64% | 2510 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,727 psi | 85% | 2575 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 76 powders for 7 x 57 R loaded with the .284 | 145gr | Speer Boat-Tail. Alliant Reloder-26 delivers the highest muzzle velocity at 2,743 fps; across all powders the maximum-charge window runs from 1,686 fps to 2,743 fps. Accurate 3100 gives the best case fill at 100 %, and 76 of the 76 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 66–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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. Somchem S365, ReloadSwiss RS 70, Alliant Reloder-17 rank at the top here: for 7 x 57 R with the .284 | 145gr | Speer Boat-Tail they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 3100, ADI AR 2209 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.