Load Specifications
Load data in caliber 7 x 72 R with .284 | 183gr | Sierra MatchKing bullet and 32 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, IMR 4831 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 4064 | <<locked>> | 82% | 36,260 psi | 89% | 2119 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 36,448 psi | 90% | 2192 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 35,998 psi | 89% | 2090 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 35,201 psi | 87% | 2106 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 90% | 35,302 psi | 87% | 2159 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,621 psi | 85% | 2175 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,663 psi | 83% | 2162 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 36,651 psi | 90% | 2274 fps | 96.1% |
| Bofors RP3 | <<locked>> | 82% | 34,722 psi | 86% | 2113 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 82% | 35,737 psi | 88% | 2113 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 36,274 psi | 89% | 2152 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 36,172 psi | 89% | 2159 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,867 psi | 86% | 1388 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,259 psi | 87% | 2067 fps | 97.3% |
| IMR 4831 | <<locked>> | 96% | 36,100 psi | 89% | 2165 fps | 97% |
| Norma URP | <<locked>> | 90% | 34,954 psi | 86% | 2149 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 82% | 36,637 psi | 90% | 2159 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,447 psi | 87% | 1427 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 34,548 psi | 85% | 2185 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 36,274 psi | 89% | 2205 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 84% | 34,635 psi | 85% | 2106 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,868 psi | 88% | 2152 fps | 97.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 35,766 psi | 88% | 2028 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 35,839 psi | 88% | 2113 fps | 98.4% |
| Somchem S365 | <<locked>> | 94% | 35,085 psi | 86% | 2192 fps | 99.3% |
| Unknown powder | <<locked>> | 88% | 35,897 psi | 88% | 2152 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 90% | 36,564 psi | 90% | 2110 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 88% | 35,940 psi | 89% | 2133 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 88% | 35,955 psi | 89% | 2169 fps | 96.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,737 psi | 88% | 2224 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 34,679 psi | 85% | 2090 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 29,849 psi | 74% | 2136 fps | 96.5% |
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% | 33,866 psi | 83% | 2077 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 31,807 psi | 78% | 2100 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 33,924 psi | 84% | 2047 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,127 psi | 82% | 2067 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 33,083 psi | 81% | 2110 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 28,689 psi | 71% | 2037 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 28,224 psi | 70% | 2031 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 34,345 psi | 85% | 2221 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 32,372 psi | 80% | 2067 fps | 98% |
| Hodgdon H380 | <<locked>> | 80% | 33,388 psi | 82% | 2067 fps | 95.3% |
| Hodgdon Hybrid 100V | 31.2 gr | 86% | 28,456 psi | 70% | 1985 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,808 psi | 83% | 2113 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,005 psi | 64% | 1240 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,228 psi | 82% | 2028 fps | 96.7% |
| IMR 4831 | 33 gr | 92% | 31,778 psi | 78% | 2080 fps | 95.5% |
| Norma URP | <<locked>> | 88% | 32,692 psi | 81% | 2103 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 34,301 psi | 84% | 2113 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,295 psi | 65% | 1273 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,530 psi | 75% | 2090 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 34,258 psi | 84% | 2162 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 30,647 psi | 75% | 2024 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,691 psi | 78% | 2064 fps | 96.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,634 psi | 83% | 1991 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 31,517 psi | 78% | 2028 fps | 97.2% |
| Somchem S365 | 30.6 gr | 82% | 24,381 psi | 60% | 1929 fps | 95.2% |
| Unknown powder | <<locked>> | 86% | 33,562 psi | 83% | 2106 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 26,977 psi | 66% | 1913 fps | 97% |
| Vihtavuori N160 | <<locked>> | 86% | 33,605 psi | 83% | 2087 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 84% | 31,749 psi | 78% | 2083 fps | 95% |
| Vihtavuori N555 | <<locked>> | 94% | 29,704 psi | 73% | 2093 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 28,660 psi | 71% | 1959 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 28,021 psi | 69% | 2083 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 54 powders for 7 x 72 R loaded with the .284 | 183gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,274 fps; across all powders the maximum-charge window runs from 1,388 fps to 2,274 fps. Accurate 3100 gives the best case fill at 100 %, and 54 of the 54 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 70–90 %, leaving at least 10 % headroom. The 183.0 gr projectile in 0.284" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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, IMR 4831, Hodgdon Hybrid 100V rank at the top here: for 7 x 72 R with the .284 | 183gr | Sierra MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 3100, 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.