Load Specifications
Load data in caliber 7 x 72 R with .285 | 173gr | Prvi Partizan FMJ BT 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% | 34,809 psi | 86% | 2260 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,346 psi | 87% | 2270 fps | 96.8% |
| Alliant Reloder-17 | <<locked>> | 84% | 34,809 psi | 86% | 2287 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,143 psi | 89% | 2323 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 36,666 psi | 90% | 2267 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,288 psi | 87% | 1483 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 36,622 psi | 90% | 2280 fps | 97.3% |
| Norma URP | <<locked>> | 88% | 35,360 psi | 87% | 2264 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,810 psi | 88% | 1522 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 34,911 psi | 86% | 2300 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,722 psi | 86% | 2277 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 82% | 35,259 psi | 87% | 2218 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 36,201 psi | 89% | 2264 fps | 98.1% |
| Somchem S355 | <<locked>> | 82% | 36,114 psi | 89% | 2221 fps | 98.5% |
| Somchem S365 | <<locked>> | 92% | 35,882 psi | 88% | 2316 fps | 99.5% |
| Unknown powder | <<locked>> | 86% | 36,027 psi | 89% | 2260 fps | 96.1% |
| Vihtavuori N150 | <<locked>> | 86% | 34,867 psi | 86% | 2178 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 86% | 36,172 psi | 89% | 2244 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 86% | 36,405 psi | 90% | 2280 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 98% | 36,593 psi | 90% | 2346 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 34,737 psi | 86% | 2198 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,242 psi | 79% | 2316 fps | 98.2% |
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 4350 | <<locked>> | 84% | 30,342 psi | 75% | 2162 fps | 95% |
| Alliant Reloder-16 | 34.5 gr | 84% | 31,430 psi | 77% | 2178 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,676 psi | 76% | 2188 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,485 psi | 70% | 2136 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 26,905 psi | 66% | 2041 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 65% | 1325 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 30,443 psi | 75% | 2149 fps | 95.1% |
| Norma URP | <<locked>> | 84% | 31,096 psi | 77% | 2165 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,643 psi | 66% | 1358 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,677 psi | 80% | 2247 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,460 psi | 80% | 2228 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 33,098 psi | 82% | 2172 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,881 psi | 83% | 2215 fps | 97.4% |
| Somchem S355 | <<locked>> | 80% | 33,968 psi | 84% | 2178 fps | 98% |
| Somchem S365 | 33.5 gr | 80% | 24,497 psi | 60% | 2028 fps | 95.5% |
| Unknown powder | <<locked>> | 84% | 33,910 psi | 84% | 2218 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 28,935 psi | 71% | 2051 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 82% | 31,821 psi | 78% | 2149 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 82% | 32,024 psi | 79% | 2185 fps | 95.2% |
| Vihtavuori N555 | 38 gr | 92% | 30,226 psi | 74% | 2201 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,689 psi | 71% | 2057 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,529 psi | 70% | 2205 fps | 96% |
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 22 powders for 7 x 72 R loaded with the .285 | 173gr | Prvi Partizan FMJ BT. Vihtavuori N555 delivers the highest muzzle velocity at 2,346 fps; across all powders the maximum-charge window runs from 1,483 fps to 2,346 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 22 of the 22 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 173.0 gr projectile in 0.285" 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 .285 | 173gr | Prvi Partizan FMJ BT 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.