Load Specifications
Load data in caliber 7 x 57 R with .284 | 171gr | Barnes Match Burner BT bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Alliant Reloder-16 and Somchem S365.
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 3100ᴾ | <<locked>> | 100% | 41,829 psi | 85% | 2398 fps | 97.1% |
| Accurate 4064 | <<locked>> | 82% | 43,018 psi | 87% | 2352 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 44,498 psi | 90% | 2457 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 84% | 44,280 psi | 90% | 2372 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 44,106 psi | 89% | 2395 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 82% | 44,396 psi | 90% | 2405 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 92% | 43,627 psi | 88% | 2464 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 88% | 43,845 psi | 89% | 2490 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,972 psi | 81% | 2425 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 41,611 psi | 84% | 2520 fps | 98.4% |
| Bofors RP3 | <<locked>> | 84% | 43,801 psi | 89% | 2398 fps | 99.9% |
| Bofors RP7 | <<locked>> | 88% | 44,527 psi | 90% | 2375 fps | 96% |
| Hodgdon H380 | <<locked>> | 82% | 41,887 psi | 85% | 2359 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 90% | 44,338 psi | 90% | 2454 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,946 psi | 87% | 2405 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 43,903 psi | 89% | 2470 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,766 psi | 73% | 1526 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 43,743 psi | 89% | 2356 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,642 psi | 89% | 2359 fps | 96.3% |
| IMR 4831 | <<locked>> | 92% | 42,554 psi | 86% | 2408 fps | 98.8% |
| Lovex S062 | <<locked>> | 82% | 43,772 psi | 89% | 2356 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 43,120 psi | 87% | 2359 fps | 97.6% |
| Lovex S070 | <<locked>> | 90% | 43,439 psi | 88% | 2382 fps | 96.6% |
| Norma 203B | <<locked>> | 82% | 43,714 psi | 89% | 2395 fps | 99.6% |
| Norma MRPᴾ | <<locked>> | 100% | 44,556 psi | 90% | 2533 fps | 96.6% |
| Norma URP | <<locked>> | 92% | 44,469 psi | 90% | 2454 fps | 99% |
| Ramshot Big Game | <<locked>> | 82% | 43,526 psi | 88% | 2415 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 92% | 43,149 psi | 88% | 2444 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,289 psi | 74% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,235 psi | 86% | 2343 fps | 96.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 43,613 psi | 88% | 2490 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 44,353 psi | 90% | 2480 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 43,932 psi | 89% | 2493 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 86% | 44,034 psi | 89% | 2395 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 88% | 44,527 psi | 90% | 2375 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 88% | 43,120 psi | 87% | 2359 fps | 97.6% |
| Shooters World Precision | <<locked>> | 82% | 43,772 psi | 89% | 2356 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 43,439 psi | 88% | 2382 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 42,438 psi | 86% | 2402 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 43,729 psi | 89% | 2280 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,685 psi | 87% | 2310 fps | 96.2% |
| Somchem S355 | <<locked>> | 84% | 42,090 psi | 85% | 2352 fps | 99.6% |
| Somchem S365 | <<locked>> | 94% | 42,366 psi | 86% | 2457 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 42,728 psi | 87% | 2336 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 43,482 psi | 88% | 2402 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 82% | 44,019 psi | 89% | 2349 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 42,714 psi | 87% | 2405 fps | 98.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,932 psi | 89% | 2493 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 43,337 psi | 88% | 2385 fps | 99.8% |
| Winchester 760 | <<locked>> | 90% | 44,338 psi | 90% | 2454 fps | 96.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,737 psi | 72% | 2438 fps | 99.6% |
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>> | 96% | 36,651 psi | 74% | 2303 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 40,408 psi | 82% | 2310 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,691 psi | 64% | 2208 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 39,117 psi | 79% | 2280 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,928 psi | 79% | 2303 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,713 psi | 85% | 2359 fps | 99% |
| Alliant Reloder-16 | 36 gr | 80% | 30,197 psi | 61% | 2169 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,518 psi | 68% | 2280 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,833 psi | 56% | 2139 fps | 95.6% |
| Alliant Reloder-26 | 45.7 gr | 92% | 33,823 psi | 69% | 2349 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 38,609 psi | 78% | 2306 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 41,872 psi | 85% | 2326 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 39,363 psi | 80% | 2310 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 38,885 psi | 79% | 2352 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,760 psi | 56% | 2087 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 88% | 41,060 psi | 83% | 2415 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,716 psi | 54% | 1365 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,089 psi | 83% | 2310 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,089 psi | 83% | 2313 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 30,734 psi | 62% | 2169 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 41,133 psi | 83% | 2313 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 35,940 psi | 73% | 2221 fps | 95.6% |
| Lovex S070 | <<locked>> | 86% | 38,464 psi | 78% | 2290 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 41,104 psi | 83% | 2349 fps | 99.3% |
| Norma MRP | <<locked>> | 98% | 41,887 psi | 85% | 2484 fps | 95.8% |
| Norma URP | <<locked>> | 82% | 32,140 psi | 65% | 2211 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 40,611 psi | 82% | 2362 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 88% | 37,985 psi | 77% | 2343 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,977 psi | 55% | 1394 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,769 psi | 81% | 2297 fps | 96% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,679 psi | 72% | 2339 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 31,386 psi | 64% | 2221 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 33,794 psi | 69% | 2277 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 36,332 psi | 74% | 2257 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 41,872 psi | 85% | 2326 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,940 psi | 73% | 2221 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 41,133 psi | 83% | 2313 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 38,464 psi | 78% | 2290 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,217 psi | 75% | 2303 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,769 psi | 79% | 2201 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 39,813 psi | 81% | 2260 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 37,173 psi | 75% | 2260 fps | 98.9% |
| Somchem S365 | 36.8 gr | 80% | 27,035 psi | 55% | 2123 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 80% | 35,317 psi | 72% | 2205 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 31,444 psi | 64% | 2165 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 41,423 psi | 84% | 2306 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,909 psi | 67% | 2211 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 88% | 29,878 psi | 61% | 2208 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,169 psi | 63% | 2142 fps | 97.5% |
| Winchester 760 | <<locked>> | 86% | 38,885 psi | 79% | 2352 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,760 psi | 56% | 2211 fps | 96.1% |
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 | 171gr | Barnes Match Burner BT. Norma MRP delivers the highest muzzle velocity at 2,533 fps; across all powders the maximum-charge window runs from 1,526 fps to 2,533 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 71–90 %, leaving at least 10 % headroom. The 171.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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. Alliant Reloder-26, Alliant Reloder-16, Somchem S365 rank at the top here: for 7 x 57 R with the .284 | 171gr | Barnes Match Burner BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, ADI AR 2213, Alliant Reloder-19 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.