Load Specifications
Load data in caliber 7 x 72 R with .284 | 139gr | Sellier & Bellot SPRN bullet and 19 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Vihtavuori N150 and ReloadSwiss RS 14.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 82% | 34,853 psi | 86% | 2480 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 36,347 psi | 90% | 2516 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 88% | 36,071 psi | 89% | 2585 fps | 96.5% |
| Bofors RP3 | <<locked>> | 84% | 35,882 psi | 88% | 2516 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 35,143 psi | 87% | 2507 fps | 96.2% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 35,215 psi | 87% | 2523 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,824 psi | 86% | 1690 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 36,448 psi | 90% | 2470 fps | 95.7% |
| Lovex S062 | <<locked>> | 82% | 36,434 psi | 90% | 2484 fps | 97.7% |
| Norma 203B | <<locked>> | 82% | 36,158 psi | 89% | 2513 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,143 psi | 87% | 1732 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 35,940 psi | 89% | 2598 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 86% | 35,737 psi | 88% | 2510 fps | 96.9% |
| Shooters World Precision | <<locked>> | 82% | 36,434 psi | 90% | 2484 fps | 97.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 34,650 psi | 85% | 2385 fps | 99.6% |
| Somchem S355 | <<locked>> | 84% | 34,679 psi | 85% | 2467 fps | 96.3% |
| Somchem S365 | <<locked>> | 96% | 36,405 psi | 90% | 2605 fps | 98.2% |
| Vihtavuori N150 | <<locked>> | 90% | 35,636 psi | 88% | 2470 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 36,216 psi | 89% | 2490 fps | 96.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 80% | 32,692 psi | 81% | 2431 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,952 psi | 79% | 2411 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 86% | 33,707 psi | 83% | 2526 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 31,270 psi | 77% | 2408 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 33,243 psi | 82% | 2461 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,866 psi | 81% | 2467 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,860 psi | 64% | 1509 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,418 psi | 85% | 2425 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 34,200 psi | 84% | 2434 fps | 97% |
| Norma 203B | <<locked>> | 80% | 33,939 psi | 84% | 2461 fps | 95.4% |
| ReloadSwiss RS 14 | 12.6 gr | 80% | 25,976 psi | 64% | 1545 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,544 psi | 73% | 2421 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 82% | 31,415 psi | 77% | 2405 fps | 95.3% |
| Shooters World Precision | <<locked>> | 80% | 34,200 psi | 84% | 2434 fps | 97% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,460 psi | 80% | 2336 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 32,547 psi | 80% | 2418 fps | 95.5% |
| Somchem S365 | 41.1 gr | 90% | 30,226 psi | 74% | 2444 fps | 95.8% |
| Vihtavuori N150 | 35.5 gr | 82% | 27,717 psi | 68% | 2277 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 33,910 psi | 84% | 2434 fps | 95.8% |
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 41 powders for 7 x 72 R loaded with the .284 | 139gr | Sellier & Bellot SPRN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,615 fps; across all powders the maximum-charge window runs from 1,690 fps to 2,615 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 41 of the 41 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 81–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.284" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, Hodgdon TrailBoss 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. Somchem S365, Vihtavuori N150, ReloadSwiss RS 14 rank at the top here: for 7 x 72 R with the .284 | 139gr | Sellier & Bellot SPRN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 4350, ADI AR 2208, Alliant Reloder-16 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.