Load Specifications
Load data in caliber 7 x 72 R with .284 | 175gr | Sierra GameKing bullet and 23 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 IMR 4831.
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>> | 90% | 36,274 psi | 89% | 2267 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 34,621 psi | 85% | 2228 fps | 96.5% |
| Alliant Reloder-17 | <<locked>> | 86% | 36,477 psi | 90% | 2300 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,389 psi | 87% | 2283 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 36,448 psi | 90% | 2359 fps | 96.3% |
| Bofors RP3 | <<locked>> | 82% | 36,593 psi | 90% | 2228 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 35,911 psi | 88% | 2231 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,273 psi | 87% | 1463 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 35,259 psi | 87% | 2231 fps | 96.8% |
| Norma URP | <<locked>> | 88% | 34,563 psi | 85% | 2224 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,476 psi | 87% | 1496 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 36,332 psi | 89% | 2306 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 36,230 psi | 89% | 2287 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 82% | 34,505 psi | 85% | 2182 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 35,375 psi | 87% | 2221 fps | 97.8% |
| Somchem S355 | <<locked>> | 82% | 35,389 psi | 87% | 2185 fps | 98.3% |
| Somchem S365 | <<locked>> | 92% | 34,925 psi | 86% | 2274 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 35,940 psi | 89% | 2175 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 88% | 36,216 psi | 89% | 2224 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 88% | 35,534 psi | 88% | 2228 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 98% | 35,650 psi | 88% | 2303 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 36,289 psi | 89% | 2205 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,502 psi | 78% | 2270 fps | 97.7% |
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% | 31,720 psi | 78% | 2175 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 32,590 psi | 80% | 2182 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,965 psi | 74% | 2149 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 92% | 27,949 psi | 69% | 2100 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 34,040 psi | 84% | 2303 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 34,301 psi | 84% | 2182 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,007 psi | 69% | 2051 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,121 psi | 64% | 1302 fps | 100% |
| IMR 4831 | 34.9 gr | 86% | 30,864 psi | 76% | 2136 fps | 95.2% |
| Norma URP | <<locked>> | 86% | 32,460 psi | 80% | 2178 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,397 psi | 65% | 1335 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,879 psi | 79% | 2205 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 33,808 psi | 83% | 2234 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 32,343 psi | 80% | 2136 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,286 psi | 82% | 2178 fps | 97.2% |
| Somchem S355 | <<locked>> | 80% | 33,243 psi | 82% | 2139 fps | 97.8% |
| Somchem S365 | 32.5 gr | 80% | 23,989 psi | 59% | 1991 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 31,633 psi | 78% | 2090 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 31,734 psi | 78% | 2129 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 86% | 33,127 psi | 82% | 2178 fps | 95.5% |
| Vihtavuori N555 | 36.9 gr | 92% | 29,559 psi | 73% | 2165 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,123 psi | 69% | 2021 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 27,833 psi | 69% | 2159 fps | 95.4% |
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 44 powders for 7 x 72 R loaded with the .284 | 175gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,359 fps; across all powders the maximum-charge window runs from 1,463 fps to 2,359 fps. Accurate 3100 gives the best case fill at 100 %, and 44 of the 44 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 74–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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, IMR 4831 rank at the top here: for 7 x 72 R with the .284 | 175gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-25, Bofors RP7, Hodgdon H414 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.