Load Specifications
Load data in caliber 7 x 72 R with .284 | 175gr | Swift A-Frame bullet and 22 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Vihtavuori N555 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% | 35,940 psi | 89% | 2257 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,506 psi | 90% | 2267 fps | 97% |
| Alliant Reloder-17 | <<locked>> | 86% | 36,245 psi | 89% | 2290 fps | 98.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,940 psi | 86% | 2267 fps | 98.1% |
| Bofors RP3 | <<locked>> | 82% | 36,230 psi | 89% | 2218 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 35,650 psi | 88% | 2221 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,317 psi | 87% | 1460 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 34,708 psi | 85% | 2215 fps | 96.6% |
| Norma URP | <<locked>> | 90% | 36,492 psi | 90% | 2257 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,505 psi | 87% | 1493 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 36,042 psi | 89% | 2293 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,679 psi | 88% | 2270 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 84% | 36,419 psi | 90% | 2215 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 35,056 psi | 86% | 2211 fps | 97.7% |
| Somchem S355 | <<locked>> | 82% | 35,056 psi | 86% | 2175 fps | 98.2% |
| Somchem S365 | <<locked>> | 92% | 34,664 psi | 85% | 2264 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 84% | 35,592 psi | 88% | 2165 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 88% | 35,926 psi | 88% | 2215 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 88% | 34,983 psi | 86% | 2211 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 98% | 35,085 psi | 86% | 2287 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 36,071 psi | 89% | 2198 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,111 psi | 77% | 2254 fps | 97.4% |
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>> | 86% | 31,154 psi | 77% | 2159 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 86% | 32,329 psi | 80% | 2172 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,718 psi | 73% | 2136 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,443 psi | 73% | 2136 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 33,939 psi | 84% | 2172 fps | 98.4% |
| Hodgdon Hybrid 100V | 32.9 gr | 84% | 27,775 psi | 68% | 2037 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,092 psi | 64% | 1299 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 32,576 psi | 80% | 2172 fps | 95.8% |
| Norma URP | <<locked>> | 86% | 32,198 psi | 79% | 2165 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,353 psi | 65% | 1329 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,618 psi | 78% | 2195 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 33,533 psi | 83% | 2224 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 31,995 psi | 79% | 2126 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,982 psi | 81% | 2169 fps | 97% |
| Somchem S355 | <<locked>> | 80% | 32,909 psi | 81% | 2129 fps | 97.6% |
| Somchem S365 | 33 gr | 82% | 25,237 psi | 62% | 2024 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 31,328 psi | 77% | 2077 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 86% | 33,504 psi | 83% | 2162 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 86% | 32,866 psi | 81% | 2169 fps | 95.3% |
| Vihtavuori N555 | 36.6 gr | 92% | 29,283 psi | 72% | 2156 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 27,905 psi | 69% | 2011 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 96% | 27,673 psi | 68% | 2149 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 22 powders for 7 x 72 R loaded with the .284 | 175gr | Swift A-Frame. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,293 fps; across all powders the maximum-charge window runs from 1,460 fps to 2,293 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 22 of the 22 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 77–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:10.5 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. Somchem S365, Vihtavuori N555, Hodgdon Hybrid 100V rank at the top here: for 7 x 72 R with the .284 | 175gr | Swift A-Frame 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.