Load Specifications
Load data in caliber 7 x 72 R with .284 | 160gr | Swift A-Frame bullet and 17 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 ReloadSwiss RS 14.
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% | 36,550 psi | 90% | 2365 fps | 96.1% |
| Alliant Reloder-17 | <<locked>> | 86% | 36,593 psi | 90% | 2392 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,694 psi | 88% | 2375 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 36,085 psi | 89% | 2323 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,302 psi | 87% | 1539 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 36,013 psi | 89% | 2336 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,853 psi | 88% | 1578 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 36,492 psi | 90% | 2402 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 82% | 34,969 psi | 86% | 2280 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 35,694 psi | 88% | 2320 fps | 97% |
| Somchem S355 | <<locked>> | 82% | 35,824 psi | 88% | 2283 fps | 97.6% |
| Somchem S365 | <<locked>> | 92% | 35,360 psi | 87% | 2372 fps | 98.8% |
| Vihtavuori N135 | <<locked>> | 82% | 35,041 psi | 86% | 2234 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 36,593 psi | 90% | 2283 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 98% | 35,984 psi | 89% | 2402 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 36,579 psi | 90% | 2300 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,053 psi | 79% | 2352 fps | 96.3% |
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% | 34,360 psi | 85% | 2320 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 30,530 psi | 75% | 2241 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 31,995 psi | 79% | 2283 fps | 95.8% |
| Hodgdon Hybrid 100V | 34.9 gr | 86% | 30,400 psi | 75% | 2188 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 65% | 1375 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 33,968 psi | 84% | 2290 fps | 95.2% |
| ReloadSwiss RS 14 | 11.5 gr | 80% | 26,731 psi | 66% | 1407 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,358 psi | 80% | 2303 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 80% | 32,996 psi | 81% | 2234 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,475 psi | 82% | 2270 fps | 96.2% |
| Somchem S355 | <<locked>> | 80% | 33,794 psi | 83% | 2238 fps | 97% |
| Somchem S365 | 34.2 gr | 82% | 26,339 psi | 65% | 2133 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 32,953 psi | 81% | 2192 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 28,892 psi | 71% | 2110 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 94% | 31,850 psi | 78% | 2303 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,472 psi | 75% | 2159 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,211 psi | 74% | 2297 fps | 95% |
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 40 powders for 7 x 72 R loaded with the .284 | 160gr | Swift A-Frame. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,402 fps; across all powders the maximum-charge window runs from 1,539 fps to 2,402 fps. Accurate 3100 gives the best case fill at 100 %, and 40 of the 40 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 160.0 gr projectile in 0.284" calls for a 1:11.5 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, ReloadSwiss RS 14 rank at the top here: for 7 x 72 R with the .284 | 160gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 3100, Alliant Reloder-26 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.