Load Specifications
Load data in caliber 7 x 72 R with .284 | 175gr | Barnes X S bullet and 18 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N555, Somchem S365 and Alliant Reloder-23.
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>> | 86% | 34,925 psi | 86% | 2185 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 86% | 35,012 psi | 86% | 2182 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 84% | 36,535 psi | 90% | 2247 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 98% | 35,839 psi | 88% | 2238 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 36,230 psi | 89% | 2182 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 88% | 1440 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 36,405 psi | 90% | 2201 fps | 96.7% |
| Norma URP | <<locked>> | 86% | 34,969 psi | 86% | 2178 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,506 psi | 90% | 1480 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 36,492 psi | 90% | 2257 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 36,448 psi | 90% | 2238 fps | 96.1% |
| Somchem S365 | <<locked>> | 90% | 35,389 psi | 87% | 2228 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 84% | 34,751 psi | 86% | 2103 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 84% | 35,708 psi | 88% | 2159 fps | 96% |
| Vihtavuori N550 | <<locked>> | 84% | 36,042 psi | 89% | 2198 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 96% | 36,274 psi | 89% | 2260 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 36,274 psi | 89% | 2156 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,229 psi | 84% | 2280 fps | 98.1% |
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>> | 84% | 32,808 psi | 81% | 2142 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,025 psi | 81% | 2136 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,372 psi | 80% | 2152 fps | 96.9% |
| Alliant Reloder-23 | 34.2 gr | 90% | 28,964 psi | 71% | 2067 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 29,182 psi | 72% | 2021 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,948 psi | 66% | 1286 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 32,648 psi | 80% | 2119 fps | 95.3% |
| Norma URP | <<locked>> | 84% | 32,967 psi | 81% | 2133 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,340 psi | 67% | 1319 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,171 psi | 84% | 2205 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,447 psi | 85% | 2195 fps | 95.4% |
| Somchem S365 | 31 gr | 80% | 27,021 psi | 67% | 2018 fps | 96.2% |
| Vihtavuori N150 | <<locked>> | 80% | 31,241 psi | 77% | 2028 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 82% | 33,721 psi | 83% | 2113 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 82% | 33,982 psi | 84% | 2156 fps | 95.4% |
| Vihtavuori N555 | 34.3 gr | 90% | 30,734 psi | 76% | 2136 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,530 psi | 75% | 2028 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 94% | 29,066 psi | 72% | 2133 fps | 95.2% |
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 18 powders for 7 x 72 R loaded with the .284 | 175gr | Barnes X S. Winchester StaBALL HD delivers the highest muzzle velocity at 2,280 fps; across all powders the maximum-charge window runs from 1,440 fps to 2,280 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 18 of the 18 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 84–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Winchester StaBALL HD 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. Vihtavuori N555, Somchem S365, Alliant Reloder-23 rank at the top here: for 7 x 72 R with the .284 | 175gr | Barnes X S 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.