Load Specifications
Load data in caliber 7 x 72 R with .284 | 140gr | Barnes X S bullet and 12 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% | 36,071 psi | 89% | 2434 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 36,419 psi | 90% | 2451 fps | 96.7% |
| Bofors RP3 | <<locked>> | 84% | 36,027 psi | 89% | 2454 fps | 96.7% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 35,172 psi | 87% | 2454 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,998 psi | 86% | 1637 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,476 psi | 87% | 1680 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 35,781 psi | 88% | 2516 fps | 98% |
| Rottweil R 903 | <<locked>> | 86% | 36,129 psi | 89% | 2448 fps | 96.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 36,680 psi | 90% | 2362 fps | 99.6% |
| Somchem S355 | <<locked>> | 84% | 35,099 psi | 86% | 2408 fps | 95.7% |
| Somchem S365 | <<locked>> | 96% | 36,376 psi | 90% | 2530 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 90% | 35,534 psi | 88% | 2402 fps | 97.4% |
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% | 34,098 psi | 84% | 2392 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,227 psi | 79% | 2352 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 31,850 psi | 78% | 2356 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,040 psi | 81% | 2402 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 65% | 1463 fps | 100% |
| ReloadSwiss RS 14 | 11.5 gr | 80% | 26,469 psi | 65% | 1499 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,008 psi | 74% | 2356 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 84% | 34,171 psi | 84% | 2402 fps | 95.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,851 psi | 81% | 2280 fps | 99% |
| Somchem S355 | <<locked>> | 82% | 33,199 psi | 82% | 2362 fps | 95% |
| Somchem S365 | 37.5 gr | 90% | 30,719 psi | 76% | 2382 fps | 95% |
| Vihtavuori N150 | 33.2 gr | 84% | 30,139 psi | 74% | 2274 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 12 powders for 7 x 72 R loaded with the .284 | 140gr | Barnes X S. Somchem S365 delivers the highest muzzle velocity at 2,530 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,530 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 12 of the 12 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 86–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:10.5 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, Vihtavuori N150, ReloadSwiss RS 14 rank at the top here: for 7 x 72 R with the .284 | 140gr | Barnes X S 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.