Load Specifications
Load data in caliber 7 x 57 R with .284 | 180gr | Sierra MatchKing bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 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 3100ᴾ | <<locked>> | 100% | 43,947 psi | 89% | 2372 fps | 98.1% |
| Accurate 4064 | <<locked>> | 82% | 44,599 psi | 90% | 2313 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 43,569 psi | 88% | 2379 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 82% | 42,917 psi | 87% | 2287 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 42,859 psi | 87% | 2310 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 42,569 psi | 86% | 2385 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 42,583 psi | 86% | 2405 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,742 psi | 85% | 2398 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 36,695 psi | 74% | 2310 fps | 96.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 43,410 psi | 88% | 2493 fps | 99.2% |
| Bofors RP3 | <<locked>> | 82% | 42,728 psi | 87% | 2316 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 43,279 psi | 88% | 2293 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 82% | 43,381 psi | 88% | 2323 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 88% | 43,120 psi | 87% | 2372 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 41,989 psi | 85% | 2326 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 42,409 psi | 86% | 2385 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,013 psi | 73% | 1490 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 43,366 psi | 88% | 2320 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,380 psi | 86% | 2280 fps | 96.6% |
| IMR 4831 | <<locked>> | 92% | 44,382 psi | 90% | 2375 fps | 99.4% |
| Lovex S065 | <<locked>> | 86% | 41,989 psi | 85% | 2280 fps | 97.9% |
| Lovex S070 | <<locked>> | 88% | 42,409 psi | 86% | 2306 fps | 97% |
| Lovex S071ᴾ | <<locked>> | 100% | 36,535 psi | 74% | 2244 fps | 96.2% |
| Norma MRP | <<locked>> | 98% | 43,497 psi | 88% | 2457 fps | 97% |
| Norma URP | <<locked>> | 90% | 43,178 psi | 88% | 2369 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 90% | 42,003 psi | 85% | 2362 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,564 psi | 74% | 1526 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,700 psi | 89% | 2310 fps | 97.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 42,279 psi | 86% | 2405 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 42,917 psi | 87% | 2392 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 42,743 psi | 87% | 2411 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 84% | 42,917 psi | 87% | 2313 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 43,279 psi | 88% | 2293 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 41,989 psi | 85% | 2280 fps | 97.9% |
| Shooters World SW4350 | <<locked>> | 88% | 42,409 psi | 86% | 2306 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 44,106 psi | 89% | 2365 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 42,569 psi | 86% | 2201 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,961 psi | 89% | 2274 fps | 97.1% |
| Somchem S355 | <<locked>> | 84% | 43,569 psi | 88% | 2316 fps | 99.9% |
| Somchem S365 | <<locked>> | 94% | 44,295 psi | 90% | 2421 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 43,859 psi | 89% | 2365 fps | 96.5% |
| Vihtavuori N150 | <<locked>> | 86% | 44,237 psi | 90% | 2300 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 42,453 psi | 86% | 2326 fps | 99% |
| Vihtavuori N550 | <<locked>> | 90% | 44,440 psi | 90% | 2372 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 98% | 43,294 psi | 88% | 2418 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 41,800 psi | 85% | 2300 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 43,120 psi | 87% | 2372 fps | 97% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,130 psi | 75% | 2418 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>> | 92% | 33,504 psi | 68% | 2182 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 41,887 psi | 85% | 2270 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,951 psi | 63% | 2136 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 80% | 40,335 psi | 82% | 2244 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,277 psi | 82% | 2267 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,212 psi | 63% | 2142 fps | 96.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,795 psi | 71% | 2254 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 84% | 25,628 psi | 52% | 2028 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 98% | 34,548 psi | 70% | 2260 fps | 95.7% |
| Alliant Reloder-26 | 43.4 gr | 88% | 30,864 psi | 63% | 2221 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 40,059 psi | 81% | 2274 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 40,712 psi | 83% | 2247 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 40,756 psi | 83% | 2277 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 37,753 psi | 77% | 2270 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,761 psi | 58% | 2060 fps | 97.1% |
| Hodgdon Superformance | <<locked>> | 86% | 39,668 psi | 80% | 2333 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,861 psi | 54% | 1329 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 40,799 psi | 83% | 2274 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 37,289 psi | 76% | 2182 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 29,965 psi | 61% | 2096 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 34,925 psi | 71% | 2142 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 37,492 psi | 76% | 2215 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 34,214 psi | 69% | 2198 fps | 95.4% |
| Norma MRP | <<locked>> | 94% | 38,159 psi | 77% | 2352 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 31,299 psi | 63% | 2136 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 84% | 34,722 psi | 70% | 2218 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 55% | 1358 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,089 psi | 83% | 2264 fps | 97% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,028 psi | 75% | 2306 fps | 100% |
| ReloadSwiss RS 62 | 38.4 gr | 80% | 30,545 psi | 62% | 2146 fps | 95.5% |
| ReloadSwiss RS 70 | 40.1 gr | 82% | 32,764 psi | 66% | 2201 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 37,739 psi | 77% | 2224 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 40,712 psi | 83% | 2247 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,925 psi | 71% | 2142 fps | 95.9% |
| Shooters World SW4350 | <<locked>> | 84% | 37,492 psi | 76% | 2215 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,638 psi | 78% | 2270 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,914 psi | 81% | 2162 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,754 psi | 79% | 2185 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 38,435 psi | 78% | 2228 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 28,065 psi | 57% | 2096 fps | 98.2% |
| Somchem S385 | <<locked>> | 94% | 41,220 psi | 84% | 2320 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 36,579 psi | 74% | 2169 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 32,648 psi | 66% | 2136 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 80% | 32,111 psi | 65% | 2139 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 27,485 psi | 56% | 2093 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,271 psi | 65% | 2116 fps | 98.4% |
| Winchester 760 | <<locked>> | 84% | 38,014 psi | 77% | 2277 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,556 psi | 52% | 2093 fps | 95.5% |
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 48 powders for 7 x 57 R loaded with the .284 | 180gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,493 fps; across all powders the maximum-charge window runs from 1,490 fps to 2,493 fps. Accurate 3100 gives the best case fill at 100 %, and 48 of the 48 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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, ReloadSwiss RS 70, ReloadSwiss RS 62 rank at the top here: for 7 x 57 R with the .284 | 180gr | Sierra MatchKing 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.