Load Specifications
Load data in caliber 7 x 72 R with .284 | 140gr | Swift A-Frame bullet and 20 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, ReloadSwiss RS 14 and Hodgdon TrailBoss.
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 2495 | <<locked>> | 82% | 35,737 psi | 88% | 2454 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 35,795 psi | 88% | 2484 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 35,085 psi | 86% | 2467 fps | 96.7% |
| Bofors RP3 | <<locked>> | 84% | 34,374 psi | 85% | 2464 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 36,303 psi | 89% | 2507 fps | 96.4% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 36,085 psi | 89% | 2523 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,563 psi | 85% | 1663 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 36,347 psi | 90% | 2503 fps | 96.2% |
| Lovex S062 | <<locked>> | 82% | 35,418 psi | 87% | 2441 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,896 psi | 86% | 1703 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 34,824 psi | 86% | 2546 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 86% | 34,577 psi | 85% | 2461 fps | 96.3% |
| Shooters World Precision | <<locked>> | 82% | 35,418 psi | 87% | 2441 fps | 97.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 35,723 psi | 88% | 2385 fps | 99.7% |
| Somchem S355 | <<locked>> | 86% | 35,766 psi | 88% | 2470 fps | 96.5% |
| Somchem S365 | <<locked>> | 96% | 35,099 psi | 86% | 2549 fps | 97.6% |
| Vihtavuori N135 | <<locked>> | 82% | 36,129 psi | 89% | 2454 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 36,332 psi | 89% | 2461 fps | 98% |
| Vihtavuori N540 | <<locked>> | 82% | 35,534 psi | 88% | 2441 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 34,940 psi | 86% | 2434 fps | 95.9% |
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 2495 | <<locked>> | 80% | 33,359 psi | 82% | 2405 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 31,575 psi | 78% | 2385 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,922 psi | 76% | 2365 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 30,066 psi | 74% | 2359 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 34,026 psi | 84% | 2454 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,620 psi | 83% | 2464 fps | 96.2% |
| Hodgdon TrailBoss | 11.9 gr | 80% | 25,599 psi | 63% | 1483 fps | 100% |
| IMR 4895 | <<locked>> | 80% | 34,287 psi | 84% | 2454 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 33,156 psi | 82% | 2388 fps | 96.5% |
| ReloadSwiss RS 14 | 12.1 gr | 80% | 25,730 psi | 63% | 1519 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,660 psi | 71% | 2369 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 84% | 32,285 psi | 80% | 2405 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 33,156 psi | 82% | 2388 fps | 96.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,430 psi | 77% | 2293 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 33,504 psi | 83% | 2418 fps | 95.7% |
| Somchem S365 | 40.4 gr | 92% | 30,908 psi | 76% | 2441 fps | 95.9% |
| Vihtavuori N135 | <<locked>> | 80% | 33,678 psi | 83% | 2405 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 28,021 psi | 69% | 2264 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 33,301 psi | 82% | 2392 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,880 psi | 81% | 2385 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 20 powders for 7 x 72 R loaded with the .284 | 140gr | Swift A-Frame. Somchem S365 delivers the highest muzzle velocity at 2,549 fps; across all powders the maximum-charge window runs from 1,663 fps to 2,549 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 20 of the 20 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 85–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. 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. Somchem S365, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 7 x 72 R with the .284 | 140gr | Swift A-Frame 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.