Load Specifications
Load data in caliber 7 x 57 R with .284 | 145gr | Speer Grand Slam bullet and 47 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% | 43,207 psi | 88% | 2552 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 43,497 psi | 88% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,018 psi | 85% | 2638 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 84% | 42,235 psi | 86% | 2559 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,743 psi | 87% | 2694 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 41,989 psi | 85% | 2582 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,380 psi | 86% | 2595 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 94% | 44,280 psi | 90% | 2703 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 90% | 44,353 psi | 90% | 2730 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,116 psi | 77% | 2598 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,206 psi | 86% | 2746 fps | 97.1% |
| Bofors RP3 | <<locked>> | 84% | 41,669 psi | 85% | 2589 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 84% | 42,699 psi | 87% | 2595 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 43,671 psi | 89% | 2641 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 43,033 psi | 87% | 2641 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,389 psi | 72% | 1690 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 44,382 psi | 90% | 2592 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 43,062 psi | 87% | 2641 fps | 97.8% |
| IMR 4895 | <<locked>> | 82% | 43,424 psi | 88% | 2628 fps | 98.8% |
| Lovex S062 | <<locked>> | 84% | 44,266 psi | 90% | 2595 fps | 99.6% |
| Lovex S065 | <<locked>> | 90% | 43,685 psi | 89% | 2589 fps | 96.4% |
| Norma 203B | <<locked>> | 84% | 44,469 psi | 90% | 2638 fps | 99% |
| Norma URP | <<locked>> | 92% | 41,989 psi | 85% | 2635 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 84% | 44,295 psi | 90% | 2654 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 94% | 43,947 psi | 89% | 2677 fps | 96.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,766 psi | 73% | 1729 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 44,570 psi | 90% | 2697 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 44,396 psi | 90% | 2740 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,611 psi | 84% | 2654 fps | 97.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,047 psi | 85% | 2671 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 82% | 43,642 psi | 89% | 2566 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 86% | 41,771 psi | 85% | 2582 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 90% | 43,685 psi | 89% | 2589 fps | 96.4% |
| Shooters World Precision | <<locked>> | 84% | 44,266 psi | 90% | 2595 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,018 psi | 87% | 2638 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 44,440 psi | 90% | 2523 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,743 psi | 87% | 2592 fps | 99% |
| Somchem S365 | <<locked>> | 96% | 42,888 psi | 87% | 2694 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 43,004 psi | 87% | 2546 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 43,627 psi | 88% | 2552 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 43,381 psi | 88% | 2572 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 92% | 43,990 psi | 89% | 2635 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 82% | 42,206 psi | 86% | 2546 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 43,192 psi | 88% | 2638 fps | 97.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,481 psi | 84% | 2674 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 44,295 psi | 90% | 2621 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,982 psi | 69% | 2585 fps | 97.5% |
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% | 40,437 psi | 82% | 2507 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 38,218 psi | 78% | 2497 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,214 psi | 69% | 2470 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 37,420 psi | 76% | 2461 fps | 96.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,856 psi | 81% | 2631 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,956 psi | 75% | 2480 fps | 98.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,769 psi | 81% | 2543 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,708 psi | 70% | 2487 fps | 95.2% |
| Alliant Reloder-17 | 42.3 gr | 80% | 31,807 psi | 65% | 2438 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,662 psi | 64% | 2438 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,869 psi | 75% | 2621 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 36,550 psi | 74% | 2484 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 80% | 37,275 psi | 76% | 2480 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,805 psi | 60% | 2333 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,364 psi | 82% | 2589 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,353 psi | 53% | 1509 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,276 psi | 80% | 2493 fps | 97.5% |
| IMR 4831 | <<locked>> | 88% | 35,404 psi | 72% | 2484 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 40,741 psi | 83% | 2572 fps | 98.3% |
| Lovex S062 | <<locked>> | 80% | 39,247 psi | 80% | 2500 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 38,798 psi | 79% | 2490 fps | 95% |
| Norma 203B | <<locked>> | 80% | 39,160 psi | 79% | 2533 fps | 98% |
| Norma URP | <<locked>> | 86% | 34,563 psi | 70% | 2474 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 38,551 psi | 78% | 2543 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 41,031 psi | 83% | 2618 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,774 psi | 54% | 1549 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,655 psi | 84% | 2641 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,837 psi | 69% | 2507 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,332 psi | 74% | 2543 fps | 95.4% |
| ReloadSwiss RS 70 | 48.4 gr | 90% | 39,262 psi | 80% | 2608 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 40,944 psi | 83% | 2513 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 34,316 psi | 70% | 2428 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,798 psi | 79% | 2490 fps | 95% |
| Shooters World Precision | <<locked>> | 80% | 39,247 psi | 80% | 2500 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,346 psi | 72% | 2477 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,999 psi | 75% | 2388 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,302 psi | 72% | 2434 fps | 97.4% |
| Somchem S365 | 41.2 gr | 82% | 27,354 psi | 55% | 2320 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 40,509 psi | 82% | 2503 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,959 psi | 83% | 2507 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,446 psi | 68% | 2375 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 36,245 psi | 74% | 2480 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 39,421 psi | 80% | 2493 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 35,549 psi | 72% | 2477 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 94% | 34,040 psi | 69% | 2513 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,689 psi | 60% | 2297 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 31,995 psi | 65% | 2523 fps | 96.4% |
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 75 powders for 7 x 57 R loaded with the .284 | 145gr | Speer Grand Slam. Alliant Reloder-26 delivers the highest muzzle velocity at 2,746 fps; across all powders the maximum-charge window runs from 1,690 fps to 2,746 fps. Accurate 3100 gives the best case fill at 100 %, and 75 of the 75 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 1:13.0 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 Grand Slam 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.