Load Specifications
Load data in caliber 7 x 57 R with .284 | 160gr | Barnes MRX BT bullet and 52 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% | 43,584 psi | 88% | 2431 fps | 100% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,509 psi | 82% | 2474 fps | 96.3% |
| Accurate 4064 | <<locked>> | 84% | 44,077 psi | 89% | 2480 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 43,207 psi | 88% | 2539 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 84% | 43,323 psi | 88% | 2461 fps | 98.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 43,714 psi | 89% | 2592 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,844 psi | 87% | 2477 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 82% | 43,207 psi | 88% | 2490 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,627 psi | 86% | 2549 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 88% | 42,554 psi | 86% | 2572 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,827 psi | 79% | 2503 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,569 psi | 88% | 2661 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 42,540 psi | 86% | 2484 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 84% | 43,685 psi | 89% | 2493 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 90% | 43,323 psi | 88% | 2539 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,032 psi | 85% | 2493 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 44,280 psi | 90% | 2536 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,491 psi | 72% | 1601 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,569 psi | 86% | 2441 fps | 99% |
| IMR 4831 | <<locked>> | 94% | 44,382 psi | 90% | 2543 fps | 98.8% |
| IMR 4895 | <<locked>> | 82% | 44,295 psi | 90% | 2520 fps | 99.5% |
| Lovex S062 | <<locked>> | 82% | 42,409 psi | 86% | 2441 fps | 99.8% |
| Lovex S065 | <<locked>> | 88% | 41,901 psi | 85% | 2438 fps | 97% |
| Lovex S070 | <<locked>> | 90% | 42,308 psi | 86% | 2464 fps | 95.9% |
| Norma 203B | <<locked>> | 82% | 42,540 psi | 86% | 2480 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 43,163 psi | 88% | 2536 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 82% | 42,279 psi | 86% | 2497 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 92% | 42,279 psi | 86% | 2526 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,897 psi | 73% | 1637 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 43,932 psi | 89% | 2477 fps | 96.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 42,467 psi | 86% | 2575 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 43,149 psi | 88% | 2562 fps | 98.3% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,873 psi | 87% | 2575 fps | 97.8% |
| Rottweil R 902 | <<locked>> | 82% | 44,454 psi | 90% | 2457 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 86% | 42,728 psi | 87% | 2480 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,901 psi | 85% | 2438 fps | 97% |
| Shooters World Precision | <<locked>> | 82% | 42,409 psi | 86% | 2441 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 90% | 42,308 psi | 86% | 2464 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 44,150 psi | 90% | 2533 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,873 psi | 87% | 2372 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,295 psi | 90% | 2438 fps | 96.2% |
| Somchem S355 | <<locked>> | 86% | 43,656 psi | 89% | 2487 fps | 99.6% |
| Somchem S365 | <<locked>> | 96% | 44,106 psi | 89% | 2592 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 43,947 psi | 89% | 2431 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 44,483 psi | 90% | 2470 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 42,337 psi | 86% | 2487 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 82% | 43,062 psi | 87% | 2438 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 44,483 psi | 90% | 2539 fps | 98.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,859 psi | 87% | 2579 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,351 psi | 86% | 2470 fps | 99.6% |
| Winchester 760 | <<locked>> | 90% | 43,323 psi | 88% | 2539 fps | 96.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,693 psi | 70% | 2507 fps | 99% |
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% | 40,915 psi | 83% | 2392 fps | 100% |
| Accurate 3100 | <<locked>> | 98% | 37,666 psi | 76% | 2421 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 38,740 psi | 79% | 2388 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,605 psi | 66% | 2326 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 38,189 psi | 77% | 2362 fps | 97.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,901 psi | 83% | 2533 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,710 psi | 76% | 2382 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,437 psi | 82% | 2438 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,156 psi | 67% | 2343 fps | 95.8% |
| Alliant Reloder-17 | 41 gr | 80% | 32,343 psi | 66% | 2349 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,558 psi | 58% | 2251 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,070 psi | 71% | 2474 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 37,318 psi | 76% | 2385 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 80% | 38,159 psi | 77% | 2388 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 88% | 40,509 psi | 82% | 2487 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,427 psi | 58% | 2195 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,408 psi | 84% | 2487 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 54% | 1427 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,089 psi | 81% | 2392 fps | 98.5% |
| IMR 4831 | <<locked>> | 84% | 31,676 psi | 64% | 2287 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 41,437 psi | 84% | 2467 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 39,943 psi | 81% | 2395 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,014 psi | 75% | 2343 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 39,856 psi | 81% | 2418 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 39,784 psi | 81% | 2428 fps | 98.8% |
| Norma URP | <<locked>> | 84% | 33,069 psi | 67% | 2326 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,537 psi | 80% | 2444 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 90% | 39,624 psi | 80% | 2477 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,556 psi | 54% | 1460 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,566 psi | 78% | 2372 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,519 psi | 70% | 2411 fps | 99.7% |
| ReloadSwiss RS 62 | 43.1 gr | 84% | 32,590 psi | 66% | 2346 fps | 95.1% |
| ReloadSwiss RS 70 | 44.8 gr | 86% | 34,969 psi | 71% | 2402 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 41,568 psi | 84% | 2408 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 34,969 psi | 71% | 2329 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,014 psi | 75% | 2343 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 39,943 psi | 81% | 2395 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 39,856 psi | 81% | 2418 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,085 psi | 73% | 2379 fps | 97.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,637 psi | 76% | 2283 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,350 psi | 84% | 2388 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 35,926 psi | 73% | 2339 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 25,846 psi | 52% | 2175 fps | 96% |
| Vihtavuori N135 | <<locked>> | 80% | 41,263 psi | 84% | 2388 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,113 psi | 69% | 2277 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 32,416 psi | 66% | 2280 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 40,321 psi | 82% | 2392 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,098 psi | 69% | 2333 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 90% | 30,618 psi | 62% | 2320 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,168 psi | 61% | 2211 fps | 96.6% |
| Winchester 760 | <<locked>> | 88% | 40,509 psi | 82% | 2487 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,529 psi | 58% | 2323 fps | 95.9% |
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 52 powders for 7 x 57 R loaded with the .284 | 160gr | Barnes MRX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,661 fps; across all powders the maximum-charge window runs from 1,601 fps to 2,661 fps. Accurate 3100 gives the best case fill at 100 %, and 52 of the 52 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 160.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-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 | 160gr | Barnes MRX 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.