Load Specifications
Load data in caliber 7 x 72 R with .284 | 160gr | Speer Hot-Cor bullet and 22 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 Winchester 6.5 StaBALL.
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% | 36,419 psi | 90% | 2320 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 82% | 36,419 psi | 90% | 2290 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 35,520 psi | 87% | 2306 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 86% | 35,056 psi | 86% | 2379 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,939 psi | 84% | 2356 fps | 96.9% |
| Bofors RP3 | <<locked>> | 82% | 35,056 psi | 86% | 2310 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 36,666 psi | 90% | 2356 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 36,666 psi | 90% | 2365 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,983 psi | 86% | 1542 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,723 psi | 88% | 2267 fps | 96.7% |
| IMR 4831 | <<locked>> | 96% | 36,390 psi | 90% | 2365 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,418 psi | 87% | 1581 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 34,998 psi | 86% | 2388 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 84% | 35,244 psi | 87% | 2310 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 36,274 psi | 89% | 2352 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 35,926 psi | 88% | 2221 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 36,245 psi | 89% | 2313 fps | 97.9% |
| Somchem S365 | <<locked>> | 94% | 35,694 psi | 88% | 2402 fps | 99% |
| Vihtavuori N150 | <<locked>> | 88% | 34,751 psi | 86% | 2264 fps | 98.6% |
| Vihtavuori N550 | <<locked>> | 88% | 36,521 psi | 90% | 2372 fps | 95.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,100 psi | 89% | 2425 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 35,056 psi | 86% | 2283 fps | 97.5% |
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% | 34,258 psi | 84% | 2277 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 34,330 psi | 85% | 2244 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,417 psi | 82% | 2260 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,763 psi | 76% | 2270 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 30,284 psi | 75% | 2260 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 32,692 psi | 81% | 2260 fps | 97.4% |
| Hodgdon Hybrid 100V | 36.1 gr | 88% | 30,429 psi | 75% | 2211 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,258 psi | 84% | 2313 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,889 psi | 64% | 1375 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,605 psi | 83% | 2221 fps | 96% |
| IMR 4831 | <<locked>> | 94% | 34,229 psi | 84% | 2320 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,382 psi | 65% | 1414 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,705 psi | 76% | 2280 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 80% | 30,879 psi | 76% | 2211 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,010 psi | 79% | 2257 fps | 95.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,779 psi | 83% | 2182 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 31,894 psi | 79% | 2218 fps | 96.5% |
| Somchem S365 | 35.5 gr | 84% | 26,179 psi | 64% | 2156 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 27,122 psi | 67% | 2090 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 86% | 34,171 psi | 84% | 2323 fps | 95% |
| Vihtavuori N555 | <<locked>> | 96% | 31,763 psi | 78% | 2326 fps | 95.2% |
| Winchester 6.5 StaBALL | 38.4 gr | 84% | 30,908 psi | 76% | 2188 fps | 95.9% |
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 22 powders for 7 x 72 R loaded with the .284 | 160gr | Speer Hot-Cor. Vihtavuori N555 delivers the highest muzzle velocity at 2,425 fps; across all powders the maximum-charge window runs from 1,542 fps to 2,425 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 22 of the 22 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 84–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:12.0 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, Winchester 6.5 StaBALL rank at the top here: for 7 x 72 R with the .284 | 160gr | Speer Hot-Cor 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.