Load Specifications
Load data in caliber 7 x 72 R with .284 | 139gr | Hornady InterLock FP bullet and 16 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% | 35,389 psi | 87% | 2497 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 34,563 psi | 85% | 2477 fps | 96.8% |
| Alliant Reloder-17 | <<locked>> | 88% | 36,434 psi | 90% | 2602 fps | 96.7% |
| Bofors RP3 | <<locked>> | 84% | 36,318 psi | 89% | 2533 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 35,505 psi | 87% | 2520 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,722 psi | 86% | 1693 fps | 100% |
| Norma 203B | <<locked>> | 82% | 36,608 psi | 90% | 2526 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 82% | 36,143 psi | 89% | 2536 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,041 psi | 86% | 1732 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 36,318 psi | 89% | 2612 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 86% | 36,230 psi | 89% | 2523 fps | 97.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 34,882 psi | 86% | 2392 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 35,143 psi | 87% | 2480 fps | 96.5% |
| Somchem S365 | <<locked>> | 96% | 36,738 psi | 90% | 2615 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 90% | 36,100 psi | 89% | 2484 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 36,477 psi | 90% | 2500 fps | 96.8% |
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% | 33,199 psi | 82% | 2448 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,430 psi | 80% | 2428 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,055 psi | 84% | 2539 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 31,720 psi | 78% | 2425 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 33,344 psi | 82% | 2467 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,846 psi | 64% | 1512 fps | 100% |
| Norma 203B | <<locked>> | 80% | 34,389 psi | 85% | 2474 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 33,779 psi | 83% | 2477 fps | 95.1% |
| ReloadSwiss RS 14 | 12.7 gr | 80% | 25,962 psi | 64% | 1545 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,892 psi | 74% | 2434 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 82% | 31,879 psi | 79% | 2418 fps | 95.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,938 psi | 81% | 2352 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 32,982 psi | 81% | 2431 fps | 95.7% |
| Somchem S365 | 40.6 gr | 88% | 28,732 psi | 71% | 2405 fps | 95.1% |
| Vihtavuori N150 | 35.9 gr | 82% | 28,123 psi | 69% | 2290 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 32,053 psi | 79% | 2392 fps | 95% |
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 39 powders for 7 x 72 R loaded with the .284 | 139gr | Hornady InterLock FP. Alliant Reloder-26 delivers the highest muzzle velocity at 2,635 fps; across all powders the maximum-charge window runs from 1,693 fps to 2,635 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 39 of the 39 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.284" calls for a 1:15.5 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 | Hornady InterLock FP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 4350, Alliant Reloder-16, Alliant Reloder-26 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.