Load Specifications
Load data in caliber 7 x 72 R with .284 | 171gr | Barnes Match Burner BT bullet and 25 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 4064 | <<locked>> | 82% | 36,419 psi | 90% | 2221 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 36,695 psi | 90% | 2293 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 82% | 36,434 psi | 90% | 2195 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 35,563 psi | 88% | 2211 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 90% | 35,491 psi | 87% | 2260 fps | 96.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 34,882 psi | 86% | 2280 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,953 psi | 84% | 2264 fps | 97.3% |
| Bofors RP3 | <<locked>> | 82% | 34,954 psi | 86% | 2215 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 36,535 psi | 90% | 2257 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,041 psi | 86% | 1470 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,549 psi | 88% | 2172 fps | 97.1% |
| IMR 4831 | <<locked>> | 96% | 36,318 psi | 89% | 2270 fps | 96.7% |
| Norma URP | <<locked>> | 90% | 35,085 psi | 86% | 2251 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,549 psi | 88% | 1506 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 34,940 psi | 86% | 2290 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 35,172 psi | 87% | 2211 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 36,172 psi | 89% | 2254 fps | 97.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 35,766 psi | 88% | 2126 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 36,100 psi | 89% | 2218 fps | 98.2% |
| Somchem S365 | <<locked>> | 94% | 35,491 psi | 87% | 2300 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 88% | 34,679 psi | 85% | 2172 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 88% | 36,230 psi | 89% | 2234 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 88% | 36,332 psi | 89% | 2274 fps | 96.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,824 psi | 88% | 2323 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 34,911 psi | 86% | 2192 fps | 97.8% |
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% | 34,156 psi | 84% | 2178 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 32,010 psi | 79% | 2198 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 34,185 psi | 84% | 2149 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,373 psi | 82% | 2165 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 33,359 psi | 82% | 2211 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 28,819 psi | 71% | 2129 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 96% | 30,110 psi | 74% | 2169 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 32,764 psi | 81% | 2169 fps | 97.8% |
| Hodgdon Hybrid 100V | 33.3 gr | 86% | 28,616 psi | 70% | 2080 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,049 psi | 64% | 1309 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,634 psi | 83% | 2129 fps | 96.5% |
| IMR 4831 | <<locked>> | 92% | 32,213 psi | 79% | 2182 fps | 95.2% |
| Norma URP | <<locked>> | 88% | 32,895 psi | 81% | 2201 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,295 psi | 65% | 1342 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,661 psi | 76% | 2188 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 80% | 30,850 psi | 76% | 2119 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,923 psi | 79% | 2162 fps | 96.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,779 psi | 83% | 2087 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 31,778 psi | 78% | 2126 fps | 96.9% |
| Somchem S365 | 33.4 gr | 84% | 25,976 psi | 64% | 2064 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 27,093 psi | 67% | 2005 fps | 96.7% |
| Vihtavuori N160 | <<locked>> | 86% | 33,779 psi | 83% | 2185 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 86% | 34,113 psi | 84% | 2228 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 96% | 31,792 psi | 78% | 2234 fps | 95.8% |
| Winchester 6.5 StaBALL | 35.3 gr | 82% | 28,761 psi | 71% | 2051 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 48 powders for 7 x 72 R loaded with the .284 | 171gr | Barnes Match Burner BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,326 fps; across all powders the maximum-charge window runs from 1,470 fps to 2,326 fps. Accurate 3100 gives the best case fill at 100 %, and 48 of the 48 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 171.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Hodgdon TrailBoss 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 | 171gr | Barnes Match Burner BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, 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.