Load Specifications
Load data in caliber 7 x 72 R with .284 | 160gr | Speer Boat-Tail 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 4350 | <<locked>> | 90% | 35,259 psi | 87% | 2369 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 36,347 psi | 90% | 2333 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,158 psi | 89% | 2382 fps | 96.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 35,679 psi | 88% | 2402 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,679 psi | 85% | 2382 fps | 97.4% |
| Bofors RP3 | <<locked>> | 82% | 35,636 psi | 88% | 2329 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 82% | 36,709 psi | 90% | 2333 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 35,157 psi | 87% | 2333 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,157 psi | 87% | 1555 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 36,260 psi | 89% | 2287 fps | 97% |
| IMR 4831 | <<locked>> | 94% | 34,969 psi | 86% | 2343 fps | 95.9% |
| Norma URP | <<locked>> | 90% | 36,013 psi | 89% | 2372 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,607 psi | 88% | 1591 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 35,650 psi | 88% | 2411 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 35,824 psi | 88% | 2326 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 34,664 psi | 85% | 2326 fps | 96.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 36,492 psi | 90% | 2241 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 34,679 psi | 85% | 2290 fps | 97.6% |
| Somchem S365 | <<locked>> | 94% | 36,376 psi | 90% | 2425 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 88% | 35,520 psi | 87% | 2290 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 98% | 34,882 psi | 86% | 2405 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 35,810 psi | 88% | 2313 fps | 97.9% |
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 4350 | <<locked>> | 88% | 33,127 psi | 82% | 2320 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,997 psi | 84% | 2280 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 34,142 psi | 84% | 2333 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,428 psi | 72% | 2244 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 96% | 30,763 psi | 76% | 2283 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 33,518 psi | 83% | 2283 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 80% | 34,577 psi | 85% | 2287 fps | 95% |
| Hodgdon Hybrid 100V | 36 gr | 86% | 29,298 psi | 72% | 2192 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,208 psi | 65% | 1388 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,142 psi | 84% | 2244 fps | 96.4% |
| IMR 4831 | <<locked>> | 92% | 32,909 psi | 81% | 2297 fps | 95.1% |
| Norma URP | <<locked>> | 88% | 33,678 psi | 83% | 2320 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,411 psi | 65% | 1421 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,314 psi | 77% | 2306 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 80% | 31,444 psi | 77% | 2231 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,474 psi | 80% | 2277 fps | 96.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,330 psi | 85% | 2198 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 32,401 psi | 80% | 2238 fps | 96.9% |
| Somchem S365 | 36.1 gr | 84% | 26,571 psi | 65% | 2175 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 27,644 psi | 68% | 2110 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 96% | 32,648 psi | 80% | 2352 fps | 95.8% |
| Winchester 6.5 StaBALL | 38.2 gr | 82% | 29,501 psi | 73% | 2162 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 45 powders for 7 x 72 R loaded with the .284 | 160gr | Speer Boat-Tail. Alliant Reloder-26 delivers the highest muzzle velocity at 2,454 fps; across all powders the maximum-charge window runs from 1,555 fps to 2,454 fps. Accurate 3100 gives the best case fill at 100 %, and 45 of the 45 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 76–90 %, 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. 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 | Speer Boat-Tail 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.