Load Specifications
Load data in caliber 7 x 72 R with .284 | 174gr | Prvi Partizan SP 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% | 34,519 psi | 85% | 2244 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,128 psi | 87% | 2254 fps | 96.7% |
| Alliant Reloder-17 | <<locked>> | 84% | 34,577 psi | 85% | 2274 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,998 psi | 89% | 2310 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 36,419 psi | 90% | 2254 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,433 psi | 87% | 1476 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 35,839 psi | 88% | 2254 fps | 97% |
| Norma URP | <<locked>> | 88% | 35,085 psi | 86% | 2247 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,621 psi | 88% | 1509 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 34,708 psi | 85% | 2283 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 36,680 psi | 90% | 2310 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 82% | 34,925 psi | 86% | 2201 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 35,940 psi | 89% | 2247 fps | 98% |
| Somchem S355 | <<locked>> | 82% | 36,071 psi | 89% | 2211 fps | 98.5% |
| Somchem S365 | <<locked>> | 92% | 35,694 psi | 88% | 2300 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 36,274 psi | 89% | 2195 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 86% | 34,577 psi | 85% | 2201 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 88% | 36,042 psi | 89% | 2251 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 98% | 36,376 psi | 90% | 2329 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 34,563 psi | 85% | 2185 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,140 psi | 79% | 2303 fps | 98.1% |
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% | 2198 fps | 95.8% |
| Alliant Reloder-16 | 34.1 gr | 84% | 31,198 psi | 77% | 2162 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,472 psi | 75% | 2172 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,282 psi | 70% | 2123 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 26,847 psi | 66% | 2031 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,136 psi | 64% | 1312 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 31,415 psi | 77% | 2159 fps | 95.5% |
| Norma URP | <<locked>> | 86% | 33,011 psi | 81% | 2201 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,701 psi | 66% | 1352 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,416 psi | 80% | 2231 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,256 psi | 79% | 2211 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 32,779 psi | 81% | 2156 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,576 psi | 83% | 2198 fps | 97.4% |
| Somchem S355 | <<locked>> | 80% | 33,649 psi | 83% | 2162 fps | 98% |
| Somchem S365 | 33.2 gr | 80% | 24,453 psi | 60% | 2018 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 31,995 psi | 79% | 2110 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 32,271 psi | 79% | 2152 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 84% | 31,691 psi | 78% | 2156 fps | 95% |
| Vihtavuori N555 | 37.6 gr | 92% | 30,037 psi | 74% | 2188 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,500 psi | 70% | 2044 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,253 psi | 70% | 2188 fps | 95.8% |
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 43 powders for 7 x 72 R loaded with the .284 | 174gr | Prvi Partizan SP. Vihtavuori N555 delivers the highest muzzle velocity at 2,329 fps; across all powders the maximum-charge window runs from 1,476 fps to 2,329 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 43 of the 43 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 75–90 %, leaving at least 10 % headroom. The 174.0 gr projectile in 0.284" calls for a 1:11.5 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. Somchem S365, Vihtavuori N555, Alliant Reloder-16 rank at the top here: for 7 x 72 R with the .284 | 174gr | Prvi Partizan SP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-25, Bofors RP7 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.