Load Specifications
Load data in caliber 7 x 72 R with .284 | 150gr | Sierra GameKing bullet and 18 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% | 35,317 psi | 87% | 2385 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 36,666 psi | 90% | 2415 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 88% | 36,419 psi | 90% | 2490 fps | 97.2% |
| Bofors RP3 | <<locked>> | 84% | 36,056 psi | 89% | 2415 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 35,636 psi | 88% | 2411 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 35,273 psi | 87% | 2418 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,940 psi | 86% | 1604 fps | 100% |
| Norma 203B | <<locked>> | 82% | 36,651 psi | 90% | 2418 fps | 97% |
| Ramshot Big Game | <<locked>> | 82% | 36,042 psi | 89% | 2425 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,998 psi | 86% | 1640 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 36,158 psi | 89% | 2497 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 86% | 36,245 psi | 89% | 2415 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,143 psi | 87% | 2408 fps | 96.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 34,867 psi | 86% | 2283 fps | 99.8% |
| Somchem S355 | <<locked>> | 84% | 34,969 psi | 86% | 2369 fps | 97% |
| Somchem S365 | <<locked>> | 96% | 36,666 psi | 90% | 2503 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 90% | 35,781 psi | 88% | 2369 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 36,260 psi | 89% | 2388 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% | 33,011 psi | 81% | 2336 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,256 psi | 79% | 2316 fps | 96.5% |
| Alliant Reloder-17 | <<locked>> | 84% | 31,778 psi | 78% | 2375 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 31,691 psi | 78% | 2316 fps | 96.5% |
| Hodgdon Hybrid 100V | 37.9 gr | 90% | 31,459 psi | 77% | 2313 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,286 psi | 82% | 2372 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,788 psi | 64% | 1430 fps | 100% |
| Norma 203B | <<locked>> | 80% | 34,287 psi | 84% | 2365 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 80% | 33,765 psi | 83% | 2372 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,223 psi | 65% | 1470 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,791 psi | 73% | 2329 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 80% | 29,733 psi | 73% | 2260 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,924 psi | 81% | 2356 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,808 psi | 81% | 2241 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 30,792 psi | 76% | 2274 fps | 95.4% |
| Somchem S365 | 38.1 gr | 88% | 28,689 psi | 71% | 2303 fps | 95.8% |
| Vihtavuori N150 | 32.8 gr | 80% | 26,252 psi | 65% | 2139 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 32,039 psi | 79% | 2290 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 42 powders for 7 x 72 R loaded with the .284 | 150gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,530 fps; across all powders the maximum-charge window runs from 1,604 fps to 2,530 fps. Accurate 3100 gives the best case fill at 100 %, and 42 of the 42 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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 | 150gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, Hodgdon H380 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.