Load Specifications
Load data in caliber 7 x 57 R with .284 | 175gr | A-Square MONO RN bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-26 and Winchester StaBALL HD.
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 3100 | <<locked>> | 96% | 43,801 psi | 89% | 2441 fps | 98.5% |
| Accurate 4350 | <<locked>> | 86% | 43,047 psi | 87% | 2438 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 44,498 psi | 90% | 2474 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 88% | 44,338 psi | 90% | 2493 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 84% | 44,556 psi | 90% | 2513 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 43,772 psi | 89% | 2464 fps | 96% |
| Alliant Reloder-22 | <<locked>> | 96% | 43,714 psi | 89% | 2507 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 44,179 psi | 90% | 2510 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,263 psi | 84% | 2487 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 94% | 43,163 psi | 88% | 2566 fps | 99.5% |
| Bofors RP15 | <<locked>> | 98% | 43,076 psi | 87% | 2493 fps | 95.8% |
| Bofors RP5 | <<locked>> | 96% | 43,714 psi | 89% | 2507 fps | 96.2% |
| Bofors RP7 | <<locked>> | 84% | 44,599 psi | 90% | 2395 fps | 97.2% |
| Hodgdon H414 | <<locked>> | 84% | 42,337 psi | 86% | 2431 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 82% | 42,859 psi | 87% | 2398 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 44,222 psi | 90% | 2434 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 44,512 psi | 90% | 2503 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,143 psi | 73% | 1562 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 42,395 psi | 86% | 2379 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 43,482 psi | 88% | 2379 fps | 97.4% |
| IMR 4831 | <<locked>> | 88% | 43,830 psi | 89% | 2438 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 43,439 psi | 88% | 2379 fps | 98.6% |
| Lovex S070 | <<locked>> | 86% | 44,164 psi | 90% | 2411 fps | 97.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,872 psi | 85% | 2408 fps | 98.1% |
| Norma MRP | <<locked>> | 94% | 43,120 psi | 87% | 2526 fps | 97.5% |
| Norma URP | <<locked>> | 86% | 42,612 psi | 86% | 2431 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 88% | 44,092 psi | 89% | 2474 fps | 98.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 43,540 psi | 88% | 2487 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,941 psi | 75% | 1601 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 44,208 psi | 90% | 2507 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 42,598 psi | 86% | 2454 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 44,483 psi | 90% | 2523 fps | 99.4% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 39,914 psi | 81% | 2493 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 92% | 42,888 psi | 87% | 2448 fps | 96% |
| Rottweil R 907 | <<locked>> | 84% | 44,599 psi | 90% | 2395 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 84% | 43,439 psi | 88% | 2379 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 86% | 44,164 psi | 90% | 2411 fps | 97.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 42,583 psi | 86% | 2329 fps | 97.3% |
| Somchem S365 | <<locked>> | 90% | 44,019 psi | 89% | 2484 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 43,381 psi | 88% | 2431 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 82% | 43,004 psi | 87% | 2349 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 44,324 psi | 90% | 2428 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 96% | 42,670 psi | 87% | 2408 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 86% | 43,714 psi | 89% | 2434 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 94% | 43,468 psi | 88% | 2487 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 43,555 psi | 88% | 2405 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 42,337 psi | 86% | 2431 fps | 97.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,482 psi | 86% | 2608 fps | 100% |
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 3100 | <<locked>> | 88% | 33,446 psi | 68% | 2241 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 35,114 psi | 71% | 2287 fps | 97.9% |
| ADI AR 2209 | <<locked>> | 90% | 41,582 psi | 84% | 2418 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,621 psi | 70% | 2297 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,812 psi | 79% | 2408 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 41,220 psi | 84% | 2415 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,089 psi | 83% | 2457 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,295 psi | 51% | 2077 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,285 psi | 65% | 2280 fps | 95.5% |
| Alliant Reloder-26 | 47 gr | 84% | 30,414 psi | 62% | 2277 fps | 95.6% |
| Bofors RP15 | <<locked>> | 96% | 40,538 psi | 82% | 2444 fps | 95% |
| Bofors RP5 | <<locked>> | 94% | 41,089 psi | 83% | 2457 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 39,508 psi | 80% | 2300 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 37,159 psi | 75% | 2329 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 80% | 40,089 psi | 81% | 2346 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,039 psi | 65% | 2201 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 82% | 38,725 psi | 79% | 2392 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,006 psi | 55% | 1394 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 37,579 psi | 76% | 2287 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,959 psi | 83% | 2329 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 33,852 psi | 69% | 2244 fps | 97.6% |
| Lovex S065 | <<locked>> | 80% | 38,522 psi | 78% | 2287 fps | 97.5% |
| Lovex S070 | <<locked>> | 80% | 36,608 psi | 74% | 2267 fps | 95.8% |
| Lovex S071 | <<locked>> | 92% | 32,358 psi | 66% | 2218 fps | 95.2% |
| Norma MRP | 48.9 gr | 90% | 37,666 psi | 76% | 2415 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 35,027 psi | 71% | 2280 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 80% | 33,910 psi | 69% | 2267 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 98% | 40,567 psi | 82% | 2431 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,557 psi | 56% | 1427 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,234 psi | 84% | 2457 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,766 psi | 71% | 2303 fps | 97.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 34,026 psi | 69% | 2303 fps | 96.7% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 37,275 psi | 76% | 2431 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 90% | 40,016 psi | 81% | 2395 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 39,508 psi | 80% | 2300 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,522 psi | 78% | 2287 fps | 97.5% |
| Shooters World SW4350 | <<locked>> | 80% | 36,608 psi | 74% | 2267 fps | 95.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,681 psi | 76% | 2238 fps | 96% |
| Somchem S365 | <<locked>> | 80% | 31,473 psi | 64% | 2241 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 38,101 psi | 77% | 2333 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 40,422 psi | 82% | 2306 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,506 psi | 74% | 2283 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 94% | 40,118 psi | 81% | 2362 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 35,940 psi | 73% | 2283 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 27,514 psi | 56% | 2146 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,549 psi | 72% | 2257 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 37,159 psi | 75% | 2329 fps | 95.8% |
| Winchester StaBALL HD | 45.2 gr | 84% | 25,266 psi | 51% | 2152 fps | 96.2% |
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 66 powders for 7 x 57 R loaded with the .284 | 175gr | A-Square MONO RN. Winchester StaBALL HD delivers the highest muzzle velocity at 2,608 fps; across all powders the maximum-charge window runs from 1,562 fps to 2,608 fps. ADI AR 2225 gives the best case fill at 100 %, and 66 of the 66 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 67–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP30 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. Norma MRP, Alliant Reloder-26, Winchester StaBALL HD rank at the top here: for 7 x 57 R with the .284 | 175gr | A-Square MONO RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, ADI AR 2225 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.