Load Specifications
Load data in caliber 7 x 72 R with .284 | 168gr | Sierra MatchKing 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, 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 4350 | <<locked>> | 90% | 35,476 psi | 87% | 2303 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 36,376 psi | 90% | 2264 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,201 psi | 89% | 2313 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 86% | 35,621 psi | 88% | 2333 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,650 psi | 85% | 2316 fps | 97.7% |
| Bofors RP3 | <<locked>> | 82% | 35,766 psi | 88% | 2264 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 35,012 psi | 86% | 2260 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,143 psi | 87% | 1499 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 36,129 psi | 89% | 2218 fps | 97.3% |
| IMR 4831 | <<locked>> | 94% | 35,143 psi | 87% | 2277 fps | 96.4% |
| Norma URP | <<locked>> | 90% | 36,143 psi | 89% | 2306 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,621 psi | 88% | 1535 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 35,708 psi | 88% | 2343 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,201 psi | 87% | 2313 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 84% | 35,911 psi | 88% | 2260 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 34,606 psi | 85% | 2257 fps | 97.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 36,651 psi | 90% | 2172 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 34,679 psi | 85% | 2221 fps | 97.8% |
| Somchem S365 | <<locked>> | 94% | 36,405 psi | 90% | 2352 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 88% | 35,650 psi | 88% | 2224 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 98% | 34,795 psi | 86% | 2336 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 35,665 psi | 88% | 2241 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 30,951 psi | 76% | 2297 fps | 96.7% |
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>> | 88% | 32,938 psi | 81% | 2251 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,214 psi | 84% | 2218 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 34,142 psi | 84% | 2267 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,312 psi | 72% | 2175 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,095 psi | 72% | 2175 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 33,518 psi | 83% | 2218 fps | 98.1% |
| Hodgdon Hybrid 100V | 34.5 gr | 86% | 29,167 psi | 72% | 2126 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,136 psi | 64% | 1339 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,214 psi | 84% | 2175 fps | 96.7% |
| IMR 4831 | <<locked>> | 92% | 33,025 psi | 81% | 2234 fps | 95.6% |
| Norma URP | <<locked>> | 88% | 33,707 psi | 83% | 2254 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,368 psi | 65% | 1368 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,212 psi | 77% | 2238 fps | 98.8% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 33,112 psi | 82% | 2267 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 31,372 psi | 77% | 2165 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,561 psi | 80% | 2211 fps | 96.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,374 psi | 85% | 2133 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 32,590 psi | 80% | 2175 fps | 97.2% |
| Somchem S365 | 33.9 gr | 82% | 25,135 psi | 62% | 2070 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 27,702 psi | 68% | 2047 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 94% | 30,748 psi | 76% | 2241 fps | 95.4% |
| Winchester 6.5 StaBALL | 36.6 gr | 82% | 29,341 psi | 72% | 2096 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 29,022 psi | 71% | 2238 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 23 powders for 7 x 72 R loaded with the .284 | 168gr | Sierra MatchKing. Somchem S365 delivers the highest muzzle velocity at 2,352 fps; across all powders the maximum-charge window runs from 1,499 fps to 2,352 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 23 of the 23 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 76–90 %, leaving at least 10 % headroom. The 168.0 gr projectile in 0.284" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, 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, Winchester 6.5 StaBALL rank at the top here: for 7 x 72 R with the .284 | 168gr | Sierra MatchKing 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.