Load Specifications
Load data in caliber 7 x 72 R with .284 | 174gr | Prvi Partizan PSP BT bullet and 23 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 IMR 4831.
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>> | 90% | 36,013 psi | 89% | 2267 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 34,650 psi | 85% | 2238 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 36,245 psi | 89% | 2303 fps | 98.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,172 psi | 87% | 2283 fps | 98.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 36,172 psi | 89% | 2356 fps | 96.1% |
| Bofors RP3 | <<locked>> | 82% | 36,332 psi | 89% | 2231 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 35,665 psi | 88% | 2231 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,230 psi | 87% | 1467 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 35,578 psi | 88% | 2244 fps | 96.8% |
| Norma URP | <<locked>> | 90% | 36,521 psi | 90% | 2267 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,737 psi | 88% | 1506 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 36,361 psi | 90% | 2313 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,940 psi | 89% | 2287 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 84% | 36,550 psi | 90% | 2228 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 35,157 psi | 87% | 2224 fps | 97.7% |
| Somchem S355 | <<locked>> | 82% | 35,186 psi | 87% | 2185 fps | 98.2% |
| Somchem S365 | <<locked>> | 92% | 34,708 psi | 85% | 2274 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 88% | 36,245 psi | 89% | 2188 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 86% | 35,157 psi | 87% | 2205 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 86% | 35,592 psi | 88% | 2247 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 98% | 35,404 psi | 87% | 2303 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 36,085 psi | 89% | 2208 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,502 psi | 78% | 2274 fps | 97.6% |
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>> | 86% | 31,473 psi | 78% | 2175 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 32,619 psi | 80% | 2188 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,791 psi | 73% | 2149 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,443 psi | 73% | 2146 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 33,750 psi | 83% | 2300 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 34,084 psi | 84% | 2185 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,079 psi | 69% | 2057 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,092 psi | 64% | 1306 fps | 100% |
| IMR 4831 | 35.3 gr | 90% | 31,589 psi | 78% | 2159 fps | 95.4% |
| Norma URP | <<locked>> | 86% | 32,242 psi | 79% | 2175 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,353 psi | 65% | 1339 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,705 psi | 78% | 2208 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 33,547 psi | 83% | 2234 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 32,155 psi | 79% | 2136 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,054 psi | 81% | 2178 fps | 97% |
| Somchem S355 | <<locked>> | 80% | 33,025 psi | 81% | 2142 fps | 97.7% |
| Somchem S365 | 33.4 gr | 82% | 25,527 psi | 63% | 2044 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 80% | 28,239 psi | 70% | 2021 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 84% | 33,054 psi | 81% | 2159 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 84% | 33,214 psi | 82% | 2198 fps | 95.6% |
| Vihtavuori N555 | 36.9 gr | 92% | 29,327 psi | 72% | 2165 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 27,949 psi | 69% | 2021 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 96% | 27,818 psi | 69% | 2162 fps | 95.2% |
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 23 powders for 7 x 72 R loaded with the .284 | 174gr | Prvi Partizan PSP BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,356 fps; across all powders the maximum-charge window runs from 1,467 fps to 2,356 fps. Alliant Reloder-23 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 78–90 %, leaving at least 10 % headroom. The 174.0 gr projectile in 0.284" calls for a 1:11.0 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, IMR 4831 rank at the top here: for 7 x 72 R with the .284 | 174gr | Prvi Partizan PSP 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.