Load Specifications
Load data in caliber 7 x 72 R with .284 | 174gr | 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 Vihtavuori N555, Alliant Reloder-16 and Somchem S365.
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% | 34,969 psi | 86% | 2257 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,708 psi | 88% | 2274 fps | 97.1% |
| Alliant Reloder-17 | <<locked>> | 84% | 35,114 psi | 86% | 2290 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,521 psi | 90% | 2326 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 34,606 psi | 85% | 2221 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,259 psi | 87% | 1480 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 34,824 psi | 86% | 2238 fps | 96.8% |
| Norma URP | <<locked>> | 88% | 35,462 psi | 87% | 2260 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,795 psi | 88% | 1516 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 35,012 psi | 86% | 2297 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,838 psi | 86% | 2277 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 82% | 35,360 psi | 87% | 2215 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 36,318 psi | 89% | 2260 fps | 98.2% |
| Somchem S355 | <<locked>> | 82% | 36,492 psi | 90% | 2224 fps | 98.7% |
| Somchem S365 | <<locked>> | 92% | 35,998 psi | 89% | 2313 fps | 99.6% |
| Unknown powder | <<locked>> | 86% | 36,419 psi | 90% | 2264 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 86% | 34,969 psi | 86% | 2175 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 86% | 36,289 psi | 89% | 2241 fps | 96.9% |
| Vihtavuori N550 | <<locked>> | 84% | 34,389 psi | 85% | 2231 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 98% | 36,738 psi | 90% | 2339 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 35,070 psi | 86% | 2201 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,576 psi | 80% | 2323 fps | 98.4% |
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% | 30,458 psi | 75% | 2159 fps | 95.2% |
| Alliant Reloder-16 | 34.5 gr | 84% | 31,517 psi | 78% | 2175 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,777 psi | 76% | 2188 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,747 psi | 71% | 2139 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,180 psi | 67% | 2044 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 65% | 1322 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 30,806 psi | 76% | 2149 fps | 95.3% |
| Norma URP | <<locked>> | 84% | 31,401 psi | 77% | 2169 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,629 psi | 66% | 1355 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,779 psi | 81% | 2244 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,561 psi | 80% | 2224 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 33,199 psi | 82% | 2169 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,214 psi | 84% | 2215 fps | 97.6% |
| Somchem S355 | <<locked>> | 80% | 34,069 psi | 84% | 2175 fps | 98.1% |
| Somchem S365 | 33.6 gr | 80% | 24,758 psi | 61% | 2031 fps | 95.7% |
| Unknown powder | <<locked>> | 84% | 34,011 psi | 84% | 2215 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 29,269 psi | 72% | 2054 fps | 98% |
| Vihtavuori N160 | <<locked>> | 82% | 31,908 psi | 79% | 2146 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 82% | 32,358 psi | 80% | 2188 fps | 95.5% |
| Vihtavuori N555 | 37.2 gr | 90% | 28,587 psi | 70% | 2156 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,761 psi | 71% | 2057 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 94% | 27,050 psi | 67% | 2156 fps | 95.1% |
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 47 powders for 7 x 72 R loaded with the .284 | 174gr | Prvi Partizan FMJ BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,349 fps; across all powders the maximum-charge window runs from 1,480 fps to 2,349 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 77–90 %, leaving at least 10 % headroom. The 174.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Hodgdon TrailBoss 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. Vihtavuori N555, Alliant Reloder-16, Somchem S365 rank at the top here: for 7 x 72 R with the .284 | 174gr | Prvi Partizan FMJ BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-22, Alliant Reloder-25 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.