Load Specifications
Load data in caliber 7 x 57 R with .284 | 151gr | Warner Tool Co. Flat Line bullet and 62 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, 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>> | 84% | 41,916 psi | 85% | 2451 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 42,148 psi | 85% | 2490 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 43,163 psi | 88% | 2572 fps | 97.5% |
| ADI AR 2206H | <<locked>> | 82% | 43,221 psi | 88% | 2503 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 88% | 44,396 psi | 90% | 2507 fps | 98.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 41,959 psi | 85% | 2579 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 43,700 psi | 89% | 2530 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 86% | 44,077 psi | 89% | 2539 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 96% | 43,207 psi | 88% | 2585 fps | 97.6% |
| Alliant Reloder-17 | <<locked>> | 92% | 43,178 psi | 88% | 2615 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,476 psi | 70% | 2425 fps | 96.5% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 42,250 psi | 86% | 2503 fps | 97.3% |
| Bofors RP3 | <<locked>> | 88% | 43,540 psi | 88% | 2536 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 82% | 43,758 psi | 89% | 2533 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 86% | 41,887 psi | 85% | 2490 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 82% | 43,540 psi | 88% | 2513 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 42,250 psi | 86% | 2526 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 42,032 psi | 85% | 2536 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,911 psi | 71% | 1601 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 41,945 psi | 85% | 2467 fps | 98.6% |
| IMR 3031 | <<locked>> | 82% | 42,960 psi | 87% | 2513 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 43,801 psi | 89% | 2490 fps | 98.2% |
| IMR 4831 | <<locked>> | 98% | 44,193 psi | 90% | 2575 fps | 97.8% |
| IMR 4895 | <<locked>> | 84% | 42,395 psi | 86% | 2520 fps | 98.5% |
| Lovex D073.6 | <<locked>> | 82% | 42,177 psi | 86% | 2487 fps | 99.9% |
| Lovex S060 | <<locked>> | 82% | 43,613 psi | 88% | 2444 fps | 98.6% |
| Lovex S062 | <<locked>> | 86% | 43,540 psi | 88% | 2493 fps | 99.4% |
| Lovex S065 | <<locked>> | 92% | 42,656 psi | 87% | 2477 fps | 95.8% |
| Norma 201 | <<locked>> | 82% | 42,366 psi | 86% | 2457 fps | 99.2% |
| Norma 202 | <<locked>> | 82% | 42,511 psi | 86% | 2467 fps | 100% |
| Norma 203B | <<locked>> | 86% | 43,381 psi | 88% | 2526 fps | 98.6% |
| Norma URP | <<locked>> | 96% | 43,482 psi | 88% | 2575 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 86% | 42,975 psi | 87% | 2543 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,302 psi | 72% | 1640 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 43,482 psi | 88% | 2589 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 43,221 psi | 88% | 2625 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 43,047 psi | 87% | 2595 fps | 97.1% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 43,627 psi | 88% | 2605 fps | 96.4% |
| Rottweil R 902 | <<locked>> | 84% | 43,004 psi | 87% | 2464 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 90% | 43,395 psi | 88% | 2526 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 42,656 psi | 87% | 2477 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 42,177 psi | 86% | 2487 fps | 99.9% |
| Shooters World Precision | <<locked>> | 86% | 43,540 psi | 88% | 2493 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 41,945 psi | 85% | 2530 fps | 98.2% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 43,453 psi | 88% | 2490 fps | 96.8% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 41,698 psi | 85% | 2474 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 43,990 psi | 89% | 2418 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 43,903 psi | 89% | 2425 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 43,453 psi | 88% | 2421 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 43,047 psi | 87% | 2487 fps | 98.4% |
| Somchem S355 | <<locked>> | 90% | 44,092 psi | 89% | 2530 fps | 99% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,048 psi | 89% | 2628 fps | 99.8% |
| Vihtavuori N133 | <<locked>> | 82% | 44,179 psi | 90% | 2415 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 42,134 psi | 85% | 2448 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 42,888 psi | 87% | 2454 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 42,438 psi | 86% | 2470 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 94% | 42,656 psi | 87% | 2523 fps | 97.1% |
| Vihtavuori N540 | <<locked>> | 86% | 44,179 psi | 90% | 2493 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 41,785 psi | 85% | 2523 fps | 96.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,738 psi | 75% | 2497 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 43,149 psi | 88% | 2507 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 84% | 43,976 psi | 89% | 2530 fps | 99.1% |
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% | 36,941 psi | 75% | 2362 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 34,911 psi | 71% | 2352 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 35,056 psi | 71% | 2415 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 40,567 psi | 82% | 2451 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 34,679 psi | 70% | 2313 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 36,724 psi | 74% | 2467 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,750 psi | 68% | 2329 fps | 97.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,390 psi | 74% | 2385 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,085 psi | 73% | 2431 fps | 95.3% |
| Alliant Reloder-17 | 38.6 gr | 82% | 31,140 psi | 63% | 2339 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 32,619 psi | 66% | 2379 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,653 psi | 80% | 2454 fps | 96.7% |
| Bofors RP3 | <<locked>> | 80% | 33,185 psi | 67% | 2329 fps | 97% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,075 psi | 83% | 2484 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 39,233 psi | 80% | 2438 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 40,872 psi | 83% | 2464 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 30,835 psi | 63% | 2280 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,709 psi | 74% | 2431 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,020 psi | 53% | 1430 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,363 psi | 80% | 2421 fps | 98.1% |
| IMR 3031 | <<locked>> | 80% | 40,147 psi | 81% | 2467 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,376 psi | 74% | 2346 fps | 96.4% |
| IMR 4831 | <<locked>> | 92% | 36,579 psi | 74% | 2428 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 37,246 psi | 76% | 2415 fps | 97.3% |
| Lovex D073.6 | <<locked>> | 80% | 39,189 psi | 79% | 2434 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 41,263 psi | 84% | 2402 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 36,230 psi | 73% | 2352 fps | 98.1% |
| Lovex S065 | <<locked>> | 90% | 40,132 psi | 81% | 2428 fps | 95% |
| Norma 201 | <<locked>> | 80% | 40,001 psi | 81% | 2415 fps | 98.9% |
| Norma 202 | <<locked>> | 80% | 39,871 psi | 81% | 2421 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 35,810 psi | 73% | 2379 fps | 96.8% |
| Norma URP | <<locked>> | 90% | 35,839 psi | 73% | 2421 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 35,331 psi | 72% | 2388 fps | 96.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,194 psi | 53% | 1463 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 37,739 psi | 77% | 2477 fps | 96.7% |
| ReloadSwiss RS 60 | 37.7 gr | 80% | 31,154 psi | 63% | 2349 fps | 97.8% |
| ReloadSwiss RS 62 | 43.3 gr | 92% | 37,536 psi | 76% | 2487 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 40,988 psi | 83% | 2552 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 37,826 psi | 77% | 2365 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 31,198 psi | 63% | 2277 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 90% | 40,132 psi | 81% | 2428 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,189 psi | 79% | 2434 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 36,230 psi | 73% | 2352 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,343 psi | 66% | 2323 fps | 95.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,756 psi | 83% | 2438 fps | 96.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,146 psi | 79% | 2425 fps | 97.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,466 psi | 84% | 2379 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,258 psi | 69% | 2254 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 41,104 psi | 83% | 2382 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,379 psi | 82% | 2438 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 32,460 psi | 66% | 2290 fps | 96.2% |
| Somchem S365 | <<locked>> | 86% | 28,152 psi | 57% | 2267 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 41,669 psi | 85% | 2375 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,130 psi | 75% | 2359 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,710 psi | 76% | 2362 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 30,560 psi | 62% | 2228 fps | 97% |
| Vihtavuori N160 | <<locked>> | 90% | 37,507 psi | 76% | 2421 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 36,347 psi | 74% | 2352 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 36,796 psi | 75% | 2425 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 98% | 34,679 psi | 70% | 2451 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 31,256 psi | 63% | 2254 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,435 psi | 78% | 2428 fps | 98% |
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 62 powders for 7 x 57 R loaded with the .284 | 151gr | Warner Tool Co. Flat Line. Somchem S365 delivers the highest muzzle velocity at 2,628 fps; across all powders the maximum-charge window runs from 1,601 fps to 2,628 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 62 of the 62 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 151.0 gr projectile in 0.284" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Hodgdon TrailBoss, ReloadSwiss RS 14 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 60, Alliant Reloder-17, ReloadSwiss RS 62 rank at the top here: for 7 x 57 R with the .284 | 151gr | Warner Tool Co. Flat Line 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.