Load Specifications
Load data in caliber 7 x 72 R with .284 | 170gr | Norma VULKAN bullet and 21 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% | 34,461 psi | 85% | 2277 fps | 96.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,128 psi | 87% | 2287 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 84% | 34,766 psi | 86% | 2310 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,027 psi | 89% | 2343 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 36,347 psi | 90% | 2283 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,186 psi | 87% | 1499 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 35,737 psi | 88% | 2283 fps | 96.9% |
| Norma URP | <<locked>> | 88% | 35,041 psi | 86% | 2277 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,679 psi | 88% | 1535 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 34,635 psi | 85% | 2316 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,403 psi | 85% | 2293 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 82% | 34,969 psi | 86% | 2234 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 35,984 psi | 89% | 2280 fps | 97.9% |
| Somchem S355 | <<locked>> | 82% | 35,882 psi | 88% | 2241 fps | 98.4% |
| Somchem S365 | <<locked>> | 92% | 35,563 psi | 88% | 2333 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 36,332 psi | 89% | 2228 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 88% | 36,695 psi | 90% | 2277 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 88% | 35,926 psi | 88% | 2280 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 98% | 36,172 psi | 89% | 2359 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 34,447 psi | 85% | 2211 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,082 psi | 79% | 2333 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>> | 86% | 32,329 psi | 80% | 2231 fps | 95.7% |
| Alliant Reloder-16 | 35.6 gr | 86% | 33,141 psi | 82% | 2241 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,487 psi | 75% | 2205 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,442 psi | 70% | 2156 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,369 psi | 70% | 2103 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,368 psi | 65% | 1342 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 31,372 psi | 77% | 2192 fps | 95.3% |
| Norma URP | <<locked>> | 86% | 33,011 psi | 81% | 2234 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 66% | 1371 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,460 psi | 80% | 2264 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,169 psi | 79% | 2241 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 32,634 psi | 80% | 2185 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,663 psi | 83% | 2231 fps | 97.2% |
| Somchem S355 | <<locked>> | 80% | 33,808 psi | 83% | 2195 fps | 97.9% |
| Somchem S365 | 33.8 gr | 80% | 24,366 psi | 60% | 2041 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 31,865 psi | 78% | 2136 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 32,329 psi | 80% | 2185 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 86% | 33,881 psi | 83% | 2238 fps | 95.7% |
| Vihtavuori N555 | 38.3 gr | 92% | 29,936 psi | 74% | 2218 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,500 psi | 70% | 2073 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,239 psi | 70% | 2215 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 21 powders for 7 x 72 R loaded with the .284 | 170gr | Norma VULKAN. Vihtavuori N555 delivers the highest muzzle velocity at 2,359 fps; across all powders the maximum-charge window runs from 1,499 fps to 2,359 fps. Alliant Reloder-23 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 79–90 %, leaving at least 10 % headroom. The 170.0 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, Vihtavuori N555, Alliant Reloder-16 rank at the top here: for 7 x 72 R with the .284 | 170gr | Norma VULKAN 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.