Load Specifications
Load data in caliber 7 x 72 R with .284 | 156gr | Norma ORYX bullet and 17 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Hodgdon Hybrid 100V and Vihtavuori N150.
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 4350 | <<locked>> | 90% | 36,056 psi | 89% | 2411 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 86% | 36,274 psi | 89% | 2444 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,157 psi | 87% | 2421 fps | 97.3% |
| Bofors RP3 | <<locked>> | 82% | 36,463 psi | 90% | 2375 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 35,534 psi | 88% | 2369 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,114 psi | 86% | 1578 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 35,592 psi | 88% | 2385 fps | 95.9% |
| Norma URP | <<locked>> | 90% | 36,651 psi | 90% | 2415 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,578 psi | 88% | 1617 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 36,274 psi | 89% | 2457 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 36,390 psi | 90% | 2369 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 35,056 psi | 86% | 2362 fps | 96.8% |
| Somchem S355 | <<locked>> | 82% | 35,244 psi | 87% | 2329 fps | 97.5% |
| Somchem S365 | <<locked>> | 92% | 34,650 psi | 85% | 2415 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 88% | 36,042 psi | 89% | 2326 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 98% | 35,491 psi | 87% | 2448 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 36,274 psi | 89% | 2349 fps | 97.8% |
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 4350 | <<locked>> | 88% | 33,634 psi | 83% | 2359 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,878 psi | 74% | 2280 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 31,299 psi | 77% | 2323 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 34,127 psi | 84% | 2326 fps | 97.8% |
| Hodgdon Hybrid 100V | 36.6 gr | 86% | 29,762 psi | 73% | 2228 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,339 psi | 65% | 1414 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 33,605 psi | 83% | 2339 fps | 95.2% |
| Norma URP | <<locked>> | 88% | 34,345 psi | 85% | 2362 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,556 psi | 65% | 1447 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,749 psi | 78% | 2346 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 32,111 psi | 79% | 2274 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,924 psi | 81% | 2313 fps | 96.1% |
| Somchem S355 | <<locked>> | 80% | 33,040 psi | 81% | 2280 fps | 96.9% |
| Somchem S365 | 36.7 gr | 84% | 27,079 psi | 67% | 2215 fps | 95.6% |
| Vihtavuori N150 | 33.2 gr | 80% | 28,282 psi | 70% | 2152 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 96% | 33,228 psi | 82% | 2395 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,849 psi | 74% | 2198 fps | 95.3% |
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 17 powders for 7 x 72 R loaded with the .284 | 156gr | Norma ORYX. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,457 fps; across all powders the maximum-charge window runs from 1,578 fps to 2,457 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 17 of the 17 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 156.0 gr projectile in 0.284" calls for a 1:13.5 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. Somchem S365, Hodgdon Hybrid 100V, Vihtavuori N150 rank at the top here: for 7 x 72 R with the .284 | 156gr | Norma ORYX 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.