Load Specifications
Load data in caliber 7 x 72 R with .284 | 160gr | Winchester Silvertip bullet and 19 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N555, Alliant Reloder-16 and Somchem S365.
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>> | 88% | 35,708 psi | 88% | 2395 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 88% | 36,027 psi | 89% | 2405 fps | 96.7% |
| Alliant Reloder-17 | <<locked>> | 84% | 35,534 psi | 88% | 2421 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 34,896 psi | 86% | 2411 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 35,317 psi | 87% | 2359 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,462 psi | 87% | 1585 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 35,259 psi | 87% | 2369 fps | 96.5% |
| Norma URP | <<locked>> | 88% | 36,201 psi | 89% | 2398 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,911 psi | 88% | 1621 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 35,563 psi | 88% | 2434 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,418 psi | 87% | 2408 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 82% | 35,882 psi | 88% | 2349 fps | 98.4% |
| Somchem S365 | <<locked>> | 92% | 36,680 psi | 90% | 2451 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 86% | 35,462 psi | 87% | 2306 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 84% | 34,708 psi | 85% | 2326 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 84% | 34,983 psi | 86% | 2369 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 96% | 35,259 psi | 87% | 2434 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 35,520 psi | 87% | 2329 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,112 psi | 82% | 2454 fps | 98.1% |
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% | 33,402 psi | 82% | 2346 fps | 95.8% |
| Alliant Reloder-16 | 37.6 gr | 84% | 32,097 psi | 79% | 2306 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 31,198 psi | 77% | 2316 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,138 psi | 72% | 2264 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,225 psi | 72% | 2211 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 65% | 1414 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 33,301 psi | 82% | 2323 fps | 95.8% |
| Norma URP | <<locked>> | 86% | 33,765 psi | 83% | 2343 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 66% | 1447 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,214 psi | 82% | 2379 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,286 psi | 82% | 2359 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 33,634 psi | 83% | 2300 fps | 97.9% |
| Somchem S365 | 36.5 gr | 80% | 25,005 psi | 62% | 2146 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 29,443 psi | 73% | 2172 fps | 97.6% |
| Vihtavuori N160 | <<locked>> | 82% | 32,387 psi | 80% | 2274 fps | 95% |
| Vihtavuori N550 | <<locked>> | 82% | 32,837 psi | 81% | 2316 fps | 95.1% |
| Vihtavuori N555 | 41.4 gr | 92% | 31,053 psi | 76% | 2333 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,153 psi | 72% | 2178 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,196 psi | 72% | 2333 fps | 95.9% |
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 41 powders for 7 x 72 R loaded with the .284 | 160gr | Winchester Silvertip. Alliant Reloder-26 delivers the highest muzzle velocity at 2,487 fps; across all powders the maximum-charge window runs from 1,585 fps to 2,487 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 41 of the 41 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 78–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Hodgdon TrailBoss, Lovex S071 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. Vihtavuori N555, Alliant Reloder-16, Somchem S365 rank at the top here: for 7 x 72 R with the .284 | 160gr | Winchester Silvertip they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-25, 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.