Load Specifications
Load data in caliber 7 x 72 R with .284 | 160gr | Winchester FailSafe bullet and 23 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% | 36,158 psi | 89% | 2313 fps | 99.9% |
| Accurate 4350 | <<locked>> | 92% | 36,361 psi | 90% | 2379 fps | 96.1% |
| ADI AR 2208 | <<locked>> | 82% | 36,027 psi | 89% | 2277 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 35,099 psi | 86% | 2293 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,519 psi | 85% | 2359 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,460 psi | 82% | 2339 fps | 96.6% |
| Bofors RP3 | <<locked>> | 82% | 34,606 psi | 85% | 2300 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 36,042 psi | 89% | 2336 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 35,940 psi | 89% | 2346 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,795 psi | 86% | 1535 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,259 psi | 87% | 2254 fps | 96.5% |
| IMR 4831 | <<locked>> | 96% | 36,013 psi | 89% | 2352 fps | 96% |
| Ramshot Big Game | <<locked>> | 82% | 36,564 psi | 90% | 2349 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,244 psi | 87% | 1575 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 34,650 psi | 85% | 2375 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 84% | 34,809 psi | 86% | 2293 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,897 psi | 88% | 2339 fps | 97.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 35,491 psi | 87% | 2211 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 35,810 psi | 88% | 2300 fps | 97.7% |
| Somchem S365 | <<locked>> | 94% | 35,114 psi | 86% | 2382 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 90% | 36,535 psi | 90% | 2297 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,505 psi | 87% | 2408 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 34,592 psi | 85% | 2270 fps | 97.2% |
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% | 33,765 psi | 83% | 2260 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 34,084 psi | 84% | 2329 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 33,910 psi | 84% | 2231 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,982 psi | 81% | 2247 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,429 psi | 75% | 2257 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 98% | 31,618 psi | 78% | 2293 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 32,227 psi | 79% | 2244 fps | 97.2% |
| Hodgdon Hybrid 100V | 35.7 gr | 88% | 30,066 psi | 74% | 2198 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,837 psi | 83% | 2300 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,933 psi | 64% | 1371 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,156 psi | 82% | 2208 fps | 95.7% |
| IMR 4831 | <<locked>> | 94% | 33,910 psi | 84% | 2306 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 34,200 psi | 84% | 2297 fps | 96.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,136 psi | 64% | 1404 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,342 psi | 75% | 2267 fps | 98% |
| Rottweil R 903 | <<locked>> | 80% | 30,443 psi | 75% | 2198 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,647 psi | 78% | 2244 fps | 95.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,301 psi | 82% | 2169 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 31,444 psi | 77% | 2205 fps | 96.3% |
| Somchem S365 | 35.9 gr | 86% | 27,470 psi | 68% | 2188 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 26,919 psi | 66% | 2080 fps | 96% |
| Vihtavuori N555 | <<locked>> | 96% | 31,473 psi | 78% | 2313 fps | 95% |
| Winchester 6.5 StaBALL | 37.9 gr | 84% | 30,414 psi | 75% | 2172 fps | 95.6% |
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 48 powders for 7 x 72 R loaded with the .284 | 160gr | Winchester FailSafe. Vihtavuori N555 delivers the highest muzzle velocity at 2,408 fps; across all powders the maximum-charge window runs from 1,535 fps to 2,408 fps. Accurate 3100 gives the best case fill at 100 %, and 48 of the 48 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 74–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, 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, Hodgdon Hybrid 100V, Winchester 6.5 StaBALL rank at the top here: for 7 x 72 R with the .284 | 160gr | Winchester FailSafe they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, Bofors RP7 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.