Load Specifications
Load data in caliber 7 x 72 R with .285 | 173gr | Prvi Partizan SP bullet and 23 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 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% | 35,592 psi | 88% | 2280 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 88% | 36,013 psi | 89% | 2293 fps | 97.2% |
| Alliant Reloder-17 | <<locked>> | 84% | 35,433 psi | 87% | 2310 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 98% | 34,650 psi | 85% | 2297 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,607 psi | 88% | 2372 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 35,172 psi | 87% | 2244 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,302 psi | 87% | 1490 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 35,157 psi | 87% | 2257 fps | 97% |
| Norma URP | <<locked>> | 88% | 35,781 psi | 88% | 2277 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,839 psi | 88% | 1529 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 35,331 psi | 87% | 2313 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,389 psi | 87% | 2297 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 82% | 35,752 psi | 88% | 2231 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 36,666 psi | 90% | 2277 fps | 98.3% |
| Somchem S355 | <<locked>> | 82% | 36,608 psi | 90% | 2238 fps | 98.7% |
| Somchem S365 | <<locked>> | 92% | 36,303 psi | 89% | 2329 fps | 99.7% |
| Unknown powder | <<locked>> | 86% | 36,738 psi | 90% | 2283 fps | 96.5% |
| Vihtavuori N150 | <<locked>> | 86% | 35,389 psi | 87% | 2195 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 84% | 34,461 psi | 85% | 2215 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 84% | 34,722 psi | 86% | 2251 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 96% | 35,085 psi | 86% | 2320 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 35,288 psi | 87% | 2215 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,895 psi | 81% | 2343 fps | 98.6% |
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% | 30,850 psi | 76% | 2178 fps | 95.4% |
| Alliant Reloder-16 | 35 gr | 84% | 31,850 psi | 78% | 2195 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 31,067 psi | 77% | 2205 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 90% | 27,383 psi | 67% | 2113 fps | 95.1% |
| Alliant Reloder-26 | 43.2 gr | 94% | 33,083 psi | 81% | 2310 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,296 psi | 67% | 2057 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 65% | 1329 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 31,140 psi | 77% | 2169 fps | 95.5% |
| Norma URP | <<locked>> | 84% | 31,502 psi | 78% | 2182 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,789 psi | 66% | 1365 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,054 psi | 81% | 2264 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,112 psi | 82% | 2247 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 33,620 psi | 83% | 2188 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,330 psi | 85% | 2228 fps | 97.7% |
| Somchem S355 | <<locked>> | 80% | 34,490 psi | 85% | 2195 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 24,874 psi | 61% | 2044 fps | 95.9% |
| Unknown powder | <<locked>> | 84% | 34,360 psi | 85% | 2231 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 29,443 psi | 73% | 2067 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 82% | 32,227 psi | 79% | 2165 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 82% | 32,445 psi | 80% | 2201 fps | 95.5% |
| Vihtavuori N555 | 37.8 gr | 90% | 29,080 psi | 72% | 2178 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,979 psi | 71% | 2070 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 94% | 27,224 psi | 67% | 2172 fps | 95.3% |
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 23 powders for 7 x 72 R loaded with the .285 | 173gr | Prvi Partizan SP. Alliant Reloder-26 delivers the highest muzzle velocity at 2,372 fps; across all powders the maximum-charge window runs from 1,490 fps to 2,372 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 23 of the 23 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 173.0 gr projectile in 0.285" 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, Alliant Reloder-16 rank at the top here: for 7 x 72 R with the .285 | 173gr | Prvi Partizan SP 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.