Load Specifications
Load data in caliber 7 x 72 R with .284 | 155gr | Geco EXPRESS bullet and 20 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 Vihtavuori N150.
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% | 35,056 psi | 86% | 2326 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 36,550 psi | 90% | 2359 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 88% | 35,868 psi | 88% | 2425 fps | 97.2% |
| Bofors RP3 | <<locked>> | 84% | 35,737 psi | 88% | 2359 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 35,041 psi | 86% | 2349 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,650 psi | 85% | 1558 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 36,535 psi | 90% | 2316 fps | 96.5% |
| Lovex S062 | <<locked>> | 82% | 36,608 psi | 90% | 2329 fps | 98.3% |
| Norma 203B | <<locked>> | 82% | 36,245 psi | 89% | 2356 fps | 97% |
| Ramshot Big Game | <<locked>> | 82% | 35,563 psi | 88% | 2362 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,070 psi | 86% | 1598 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 35,810 psi | 88% | 2434 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 86% | 35,911 psi | 88% | 2356 fps | 97.6% |
| Shooters World Precision | <<locked>> | 82% | 36,608 psi | 90% | 2329 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 34,925 psi | 86% | 2352 fps | 96.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 34,592 psi | 85% | 2228 fps | 99.8% |
| Somchem S355 | <<locked>> | 84% | 34,809 psi | 86% | 2316 fps | 97% |
| Somchem S365 | <<locked>> | 96% | 36,477 psi | 90% | 2448 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 90% | 35,505 psi | 87% | 2313 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 35,926 psi | 88% | 2329 fps | 97.2% |
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% | 32,721 psi | 81% | 2277 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,010 psi | 79% | 2260 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 84% | 31,676 psi | 78% | 2323 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 31,241 psi | 77% | 2257 fps | 96.5% |
| Hodgdon Hybrid 100V | 36.5 gr | 90% | 31,053 psi | 76% | 2254 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,802 psi | 64% | 1391 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 32,314 psi | 80% | 2221 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 34,156 psi | 84% | 2277 fps | 97.7% |
| Norma 203B | <<locked>> | 80% | 34,084 psi | 84% | 2310 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 33,272 psi | 82% | 2310 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,991 psi | 64% | 1424 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,544 psi | 73% | 2274 fps | 97.2% |
| Rottweil R 903 | <<locked>> | 80% | 29,501 psi | 73% | 2208 fps | 95.4% |
| Shooters World Precision | <<locked>> | 80% | 34,156 psi | 84% | 2277 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,677 psi | 80% | 2300 fps | 95.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,460 psi | 80% | 2185 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 30,560 psi | 75% | 2218 fps | 95.5% |
| Somchem S365 | 36.7 gr | 88% | 28,326 psi | 70% | 2244 fps | 95.7% |
| Vihtavuori N150 | 31.7 gr | 80% | 26,150 psi | 64% | 2093 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,647 psi | 78% | 2231 fps | 95.6% |
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 20 powders for 7 x 72 R loaded with the .284 | 155gr | Geco EXPRESS. Somchem S365 delivers the highest muzzle velocity at 2,448 fps; across all powders the maximum-charge window runs from 1,558 fps to 2,448 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 20 of the 20 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 85–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. 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, Vihtavuori N150 rank at the top here: for 7 x 72 R with the .284 | 155gr | Geco EXPRESS 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.