Load Specifications
Load data in caliber 7 x 72 R with .284 | 160gr | Sierra SBT GameKing 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% | 36,579 psi | 90% | 2323 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 82% | 36,564 psi | 90% | 2293 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 35,665 psi | 88% | 2310 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 86% | 35,172 psi | 87% | 2382 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,011 psi | 84% | 2359 fps | 96.9% |
| Bofors RP3 | <<locked>> | 82% | 35,201 psi | 87% | 2316 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 34,635 psi | 85% | 2313 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 36,477 psi | 90% | 2365 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,867 psi | 86% | 1542 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,839 psi | 88% | 2270 fps | 96.8% |
| IMR 4831 | <<locked>> | 96% | 36,506 psi | 90% | 2369 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,331 psi | 87% | 1581 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 35,114 psi | 86% | 2392 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 84% | 35,085 psi | 86% | 2306 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 36,390 psi | 90% | 2356 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 36,056 psi | 89% | 2228 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 36,390 psi | 90% | 2320 fps | 97.9% |
| Somchem S365 | <<locked>> | 94% | 35,795 psi | 88% | 2405 fps | 99% |
| Vihtavuori N150 | <<locked>> | 84% | 34,374 psi | 85% | 2257 fps | 98.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,187 psi | 89% | 2428 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 35,143 psi | 87% | 2290 fps | 97.5% |
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% | 34,418 psi | 85% | 2280 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 34,171 psi | 84% | 2241 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,547 psi | 83% | 2267 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,879 psi | 76% | 2277 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 30,356 psi | 75% | 2267 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 32,793 psi | 81% | 2264 fps | 97.5% |
| Hodgdon Hybrid 100V | 36.2 gr | 88% | 30,501 psi | 75% | 2215 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,389 psi | 85% | 2320 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,107 psi | 64% | 1381 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,460 psi | 82% | 2221 fps | 96% |
| IMR 4831 | <<locked>> | 94% | 34,360 psi | 85% | 2323 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,310 psi | 65% | 1414 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,777 psi | 76% | 2283 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 30,995 psi | 76% | 2215 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,894 psi | 79% | 2254 fps | 95.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,895 psi | 83% | 2185 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 31,995 psi | 79% | 2221 fps | 96.6% |
| Somchem S365 | 35.5 gr | 84% | 26,107 psi | 64% | 2152 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 30,414 psi | 75% | 2169 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 96% | 31,865 psi | 78% | 2329 fps | 95.3% |
| Winchester 6.5 StaBALL | 37.5 gr | 82% | 28,892 psi | 71% | 2139 fps | 95% |
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 | 160gr | Sierra SBT GameKing. Vihtavuori N555 delivers the highest muzzle velocity at 2,428 fps; across all powders the maximum-charge window runs from 1,542 fps to 2,428 fps. Accurate 3100 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 75–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, 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, Hodgdon Hybrid 100V, Winchester 6.5 StaBALL rank at the top here: for 7 x 72 R with the .284 | 160gr | Sierra SBT GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, 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.