Load Specifications
Load data in caliber 7 x 72 R with .284 | 175gr | Speer Deep Curl Soft Point 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, Vihtavuori N555 and Alliant Reloder-16.
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>> | 88% | 34,940 psi | 86% | 2247 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,462 psi | 87% | 2257 fps | 97% |
| Alliant Reloder-17 | <<locked>> | 84% | 34,882 psi | 86% | 2274 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,318 psi | 89% | 2313 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 34,592 psi | 85% | 2211 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,375 psi | 87% | 1473 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 34,548 psi | 85% | 2224 fps | 96.7% |
| Norma URP | <<locked>> | 88% | 35,476 psi | 87% | 2251 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,578 psi | 88% | 1506 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 34,737 psi | 86% | 2280 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,621 psi | 85% | 2260 fps | 96.3% |
| Rottweil R 903 | <<locked>> | 82% | 35,244 psi | 87% | 2201 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 36,303 psi | 89% | 2247 fps | 98.2% |
| Somchem S355 | <<locked>> | 82% | 36,143 psi | 89% | 2208 fps | 98.6% |
| Somchem S365 | <<locked>> | 92% | 35,766 psi | 88% | 2297 fps | 99.6% |
| Unknown powder | <<locked>> | 86% | 36,100 psi | 89% | 2247 fps | 96.2% |
| Vihtavuori N150 | <<locked>> | 86% | 34,911 psi | 86% | 2165 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 86% | 36,274 psi | 89% | 2228 fps | 96.9% |
| Vihtavuori N550 | <<locked>> | 86% | 36,535 psi | 90% | 2267 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 98% | 36,492 psi | 90% | 2326 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 34,867 psi | 86% | 2185 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,227 psi | 79% | 2303 fps | 98.3% |
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>> | 84% | 30,385 psi | 75% | 2149 fps | 95.1% |
| Alliant Reloder-16 | 34.2 gr | 84% | 31,488 psi | 78% | 2162 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,748 psi | 76% | 2178 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,587 psi | 70% | 2126 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 26,919 psi | 66% | 2028 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 65% | 1316 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 30,530 psi | 75% | 2133 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 31,111 psi | 77% | 2152 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,672 psi | 66% | 1348 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,721 psi | 81% | 2234 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,358 psi | 80% | 2211 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 33,112 psi | 82% | 2159 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,910 psi | 84% | 2198 fps | 97.5% |
| Somchem S355 | <<locked>> | 80% | 33,997 psi | 84% | 2162 fps | 98.1% |
| Somchem S365 | 33.2 gr | 80% | 24,511 psi | 60% | 2014 fps | 95.6% |
| Unknown powder | <<locked>> | 84% | 33,997 psi | 84% | 2205 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 28,935 psi | 71% | 2037 fps | 97.9% |
| Vihtavuori N160 | <<locked>> | 82% | 31,879 psi | 79% | 2136 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 82% | 32,068 psi | 79% | 2172 fps | 95.4% |
| Vihtavuori N555 | 36.9 gr | 90% | 28,558 psi | 70% | 2146 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,747 psi | 71% | 2044 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,514 psi | 70% | 2192 fps | 96.2% |
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 46 powders for 7 x 72 R loaded with the .284 | 175gr | Speer Deep Curl Soft Point. Alliant Reloder-26 delivers the highest muzzle velocity at 2,329 fps; across all powders the maximum-charge window runs from 1,473 fps to 2,329 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 46 of the 46 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 175.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, 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, Vihtavuori N555, Alliant Reloder-16 rank at the top here: for 7 x 72 R with the .284 | 175gr | Speer Deep Curl Soft Point they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 3100, Alliant Reloder-25 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.