Load Specifications
Load data in caliber 7 x 72 R with .284 | 158gr | Prvi Partizan Grom 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, Hodgdon Hybrid 100V and Winchester 6.5 StaBALL.
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 4064 | <<locked>> | 82% | 35,360 psi | 87% | 2310 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 82% | 35,621 psi | 88% | 2280 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 34,621 psi | 85% | 2297 fps | 97.6% |
| Alliant Reloder-17 | <<locked>> | 88% | 36,448 psi | 90% | 2418 fps | 97.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,112 psi | 82% | 2339 fps | 96.2% |
| Bofors RP3 | <<locked>> | 84% | 36,347 psi | 90% | 2346 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 35,621 psi | 88% | 2339 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 35,520 psi | 87% | 2349 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,911 psi | 86% | 1545 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,867 psi | 86% | 2257 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 82% | 36,143 psi | 89% | 2352 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,346 psi | 87% | 1585 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 36,376 psi | 90% | 2428 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 86% | 36,260 psi | 89% | 2339 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,230 psi | 87% | 2336 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 35,070 psi | 86% | 2215 fps | 99.9% |
| Somchem S355 | <<locked>> | 84% | 35,070 psi | 86% | 2300 fps | 97.3% |
| Somchem S365 | <<locked>> | 94% | 34,679 psi | 85% | 2385 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 90% | 36,071 psi | 89% | 2300 fps | 98.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,041 psi | 86% | 2408 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 36,506 psi | 90% | 2323 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 4064 | <<locked>> | 80% | 33,257 psi | 82% | 2267 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 33,272 psi | 82% | 2228 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,532 psi | 80% | 2251 fps | 97% |
| Alliant Reloder-17 | <<locked>> | 84% | 31,908 psi | 79% | 2306 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 31,212 psi | 77% | 2290 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 31,778 psi | 78% | 2247 fps | 96.9% |
| Hodgdon Hybrid 100V | 35.6 gr | 88% | 29,704 psi | 73% | 2201 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,417 psi | 82% | 2303 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,991 psi | 64% | 1381 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 32,750 psi | 81% | 2211 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 33,794 psi | 83% | 2300 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,194 psi | 65% | 1414 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,023 psi | 74% | 2267 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 80% | 29,979 psi | 74% | 2198 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,038 psi | 76% | 2241 fps | 95% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,909 psi | 81% | 2172 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 31,009 psi | 76% | 2205 fps | 95.9% |
| Somchem S365 | 35.7 gr | 86% | 26,934 psi | 66% | 2182 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 26,353 psi | 65% | 2077 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 98% | 32,953 psi | 81% | 2362 fps | 95.4% |
| Winchester 6.5 StaBALL | 37.8 gr | 84% | 30,110 psi | 74% | 2175 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 21 powders for 7 x 72 R loaded with the .284 | 158gr | Prvi Partizan Grom. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,428 fps; across all powders the maximum-charge window runs from 1,545 fps to 2,428 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 21 of the 21 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 82–90 %, leaving at least 10 % headroom. The 158.0 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, Hodgdon Hybrid 100V, Winchester 6.5 StaBALL rank at the top here: for 7 x 72 R with the .284 | 158gr | Prvi Partizan Grom 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.