Load Specifications
Load data in caliber 7 x 72 R with .284 | 160gr | Barnes MRX BT bullet and 24 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 82% | 35,230 psi | 87% | 2310 fps | 99.9% |
| Accurate 4350 | <<locked>> | 92% | 35,795 psi | 88% | 2382 fps | 96.1% |
| ADI AR 2208 | <<locked>> | 82% | 35,563 psi | 88% | 2283 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 34,795 psi | 86% | 2303 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 88% | 36,448 psi | 90% | 2421 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,112 psi | 82% | 2346 fps | 96.7% |
| Bofors RP3 | <<locked>> | 84% | 36,347 psi | 90% | 2349 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 35,911 psi | 88% | 2349 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,766 psi | 86% | 1545 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 34,969 psi | 86% | 2346 fps | 95.9% |
| Norma 203B | <<locked>> | 82% | 36,695 psi | 90% | 2346 fps | 97.6% |
| Norma URP | <<locked>> | 92% | 36,709 psi | 90% | 2388 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 82% | 36,230 psi | 89% | 2356 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,143 psi | 87% | 1585 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 36,376 psi | 90% | 2431 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 86% | 36,260 psi | 89% | 2339 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 35,549 psi | 88% | 2349 fps | 97.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 35,056 psi | 86% | 2215 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 35,157 psi | 87% | 2303 fps | 97.7% |
| Somchem S365 | <<locked>> | 94% | 34,606 psi | 85% | 2388 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 86% | 35,636 psi | 88% | 2293 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 90% | 36,274 psi | 89% | 2343 fps | 95.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,099 psi | 86% | 2415 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 36,651 psi | 90% | 2329 fps | 98% |
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% | 32,779 psi | 81% | 2260 fps | 99.7% |
| Accurate 4350 | <<locked>> | 90% | 33,504 psi | 83% | 2333 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 33,475 psi | 82% | 2234 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,416 psi | 80% | 2251 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,052 psi | 74% | 2264 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 98% | 31,227 psi | 77% | 2300 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 31,763 psi | 78% | 2251 fps | 97.2% |
| Hodgdon Hybrid 100V | 36.4 gr | 88% | 29,675 psi | 73% | 2205 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,701 psi | 63% | 1378 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 32,634 psi | 80% | 2293 fps | 95% |
| Norma 203B | <<locked>> | 80% | 34,476 psi | 85% | 2300 fps | 97% |
| Norma URP | <<locked>> | 90% | 34,272 psi | 84% | 2336 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 33,881 psi | 83% | 2306 fps | 96.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,846 psi | 64% | 1411 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,965 psi | 74% | 2274 fps | 98% |
| Rottweil R 903 | <<locked>> | 80% | 29,704 psi | 73% | 2195 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,067 psi | 77% | 2244 fps | 95.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,880 psi | 81% | 2172 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 30,792 psi | 76% | 2205 fps | 96.2% |
| Somchem S365 | 36.5 gr | 86% | 26,774 psi | 66% | 2185 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 29,269 psi | 72% | 2152 fps | 97.1% |
| Vihtavuori N160 | <<locked>> | 88% | 33,852 psi | 83% | 2293 fps | 95% |
| Vihtavuori N555 | <<locked>> | 98% | 33,011 psi | 81% | 2365 fps | 95.9% |
| Winchester 6.5 StaBALL | 38.6 gr | 84% | 29,965 psi | 74% | 2175 fps | 95.6% |
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 46 powders for 7 x 72 R loaded with the .284 | 160gr | Barnes MRX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,467 fps; across all powders the maximum-charge window runs from 1,545 fps to 2,467 fps. Accurate 3100 gives the best case fill at 100 %, and 46 of the 46 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:12.0 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, Hodgdon Hybrid 100V, Winchester 6.5 StaBALL rank at the top here: for 7 x 72 R with the .284 | 160gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Bofors RP7, Hodgdon H414 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.