Load Specifications
Load data in caliber 7 x 72 R with .284 | 175gr | Sierra MatchKing bullet and 26 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, Somchem S365 and Hodgdon Hybrid 100V.
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% | 35,012 psi | 86% | 2234 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 36,158 psi | 89% | 2198 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,027 psi | 89% | 2251 fps | 96.8% |
| Alliant Reloder-17 | <<locked>> | 86% | 35,476 psi | 87% | 2270 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,563 psi | 85% | 2254 fps | 97.9% |
| Bofors RP3 | <<locked>> | 82% | 35,621 psi | 88% | 2201 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 34,896 psi | 86% | 2198 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,244 psi | 87% | 1453 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 36,085 psi | 89% | 2156 fps | 97.5% |
| IMR 4831 | <<locked>> | 94% | 34,751 psi | 86% | 2211 fps | 96.5% |
| Norma URP | <<locked>> | 90% | 35,984 psi | 89% | 2244 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,418 psi | 87% | 1486 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 35,549 psi | 88% | 2280 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,230 psi | 87% | 2257 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 84% | 35,795 psi | 88% | 2198 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 34,548 psi | 85% | 2195 fps | 97.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 36,579 psi | 90% | 2113 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 36,709 psi | 90% | 2201 fps | 98.5% |
| Somchem S365 | <<locked>> | 94% | 36,143 psi | 89% | 2287 fps | 99.5% |
| Unknown powder | <<locked>> | 88% | 36,666 psi | 90% | 2241 fps | 96% |
| Vihtavuori N150 | <<locked>> | 88% | 35,534 psi | 88% | 2162 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 86% | 34,621 psi | 85% | 2178 fps | 96% |
| Vihtavuori N550 | <<locked>> | 86% | 34,737 psi | 86% | 2215 fps | 96% |
| Vihtavuori N555 | <<locked>> | 98% | 34,650 psi | 85% | 2274 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 35,447 psi | 87% | 2178 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 30,618 psi | 75% | 2231 fps | 96.9% |
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% | 32,706 psi | 81% | 2188 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,910 psi | 84% | 2152 fps | 98.2% |
| Alliant Reloder-16 | 33.4 gr | 86% | 31,865 psi | 78% | 2152 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,269 psi | 72% | 2119 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 28,848 psi | 71% | 2113 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 33,330 psi | 82% | 2156 fps | 98.2% |
| Hodgdon Hybrid 100V | 32.5 gr | 84% | 27,528 psi | 68% | 2028 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,208 psi | 65% | 1296 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,084 psi | 84% | 2116 fps | 96.9% |
| IMR 4831 | <<locked>> | 92% | 32,822 psi | 81% | 2172 fps | 95.8% |
| Norma URP | <<locked>> | 86% | 31,691 psi | 78% | 2149 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,469 psi | 65% | 1329 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,169 psi | 77% | 2178 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 32,808 psi | 81% | 2205 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 31,386 psi | 77% | 2106 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,430 psi | 80% | 2149 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,258 psi | 84% | 2070 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 32,561 psi | 80% | 2116 fps | 97.4% |
| Somchem S365 | 32.6 gr | 82% | 25,019 psi | 62% | 2014 fps | 95.5% |
| Unknown powder | <<locked>> | 86% | 34,403 psi | 85% | 2195 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 27,557 psi | 68% | 1991 fps | 97.1% |
| Vihtavuori N160 | <<locked>> | 84% | 32,242 psi | 79% | 2126 fps | 95% |
| Vihtavuori N550 | <<locked>> | 84% | 32,605 psi | 80% | 2169 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 94% | 30,501 psi | 75% | 2178 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 27,543 psi | 68% | 1998 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 28,863 psi | 71% | 2178 fps | 95.7% |
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 26 powders for 7 x 72 R loaded with the .284 | 175gr | Sierra MatchKing. Somchem S365 delivers the highest muzzle velocity at 2,287 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,287 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 26 of the 26 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 175.0 gr projectile in 0.284" calls for a 1:10.0 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. Alliant Reloder-16, Somchem S365, Hodgdon Hybrid 100V rank at the top here: for 7 x 72 R with the .284 | 175gr | 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.