Load Specifications
Load data in caliber 7 x 72 R with .284 | 175gr | Speer Magnum Tip Soft Point bullet and 21 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Vihtavuori N555 and ReloadSwiss RS 62.
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% | 35,563 psi | 88% | 2267 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,984 psi | 89% | 2277 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 84% | 35,650 psi | 88% | 2300 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 98% | 34,911 psi | 86% | 2290 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,694 psi | 88% | 2359 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 35,128 psi | 87% | 2228 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,317 psi | 87% | 1480 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 35,404 psi | 87% | 2247 fps | 97.1% |
| Norma URP | <<locked>> | 88% | 35,998 psi | 89% | 2267 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,839 psi | 88% | 1516 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 35,520 psi | 87% | 2303 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,404 psi | 87% | 2283 fps | 96.7% |
| Rottweil R 903 | <<locked>> | 82% | 35,940 psi | 89% | 2221 fps | 98.8% |
| Somchem S365 | <<locked>> | 92% | 36,593 psi | 90% | 2320 fps | 99.7% |
| Unknown powder | <<locked>> | 84% | 34,563 psi | 85% | 2221 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 86% | 35,563 psi | 88% | 2182 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 84% | 34,418 psi | 85% | 2198 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 84% | 34,954 psi | 86% | 2241 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 96% | 35,128 psi | 87% | 2303 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 35,259 psi | 87% | 2201 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,967 psi | 81% | 2333 fps | 98.7% |
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% | 31,038 psi | 76% | 2169 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 84% | 31,995 psi | 79% | 2185 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 31,256 psi | 77% | 2195 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 27,383 psi | 67% | 2100 fps | 95.3% |
| Alliant Reloder-26 | 43 gr | 94% | 33,431 psi | 82% | 2303 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,412 psi | 68% | 2047 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,469 psi | 65% | 1322 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 31,111 psi | 77% | 2156 fps | 95.6% |
| Norma URP | <<locked>> | 84% | 31,705 psi | 78% | 2172 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,745 psi | 66% | 1355 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,272 psi | 82% | 2254 fps | 99.7% |
| ReloadSwiss RS 62 | 38.3 gr | 86% | 33,098 psi | 82% | 2234 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 33,547 psi | 83% | 2172 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 25,019 psi | 62% | 2034 fps | 96.1% |
| Unknown powder | <<locked>> | 82% | 32,547 psi | 80% | 2175 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 29,573 psi | 73% | 2057 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 82% | 32,416 psi | 80% | 2156 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 82% | 32,677 psi | 80% | 2192 fps | 95.7% |
| Vihtavuori N555 | 37.5 gr | 90% | 29,066 psi | 72% | 2165 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,167 psi | 72% | 2064 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 94% | 27,412 psi | 68% | 2165 fps | 95.7% |
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 21 powders for 7 x 72 R loaded with the .284 | 175gr | Speer Magnum Tip Soft Point. Alliant Reloder-26 delivers the highest muzzle velocity at 2,359 fps; across all powders the maximum-charge window runs from 1,480 fps to 2,359 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 21 of the 21 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 81–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Winchester StaBALL HD 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. Alliant Reloder-26, Vihtavuori N555, ReloadSwiss RS 62 rank at the top here: for 7 x 72 R with the .284 | 175gr | Speer Magnum Tip Soft Point 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.