Load Specifications
Load data in caliber 7 x 72 R with .284 | 166gr | Peregrine VRG-2 bullet and 23 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 4350 | <<locked>> | 90% | 34,954 psi | 86% | 2310 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 36,027 psi | 89% | 2274 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,085 psi | 89% | 2329 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 35,447 psi | 87% | 2346 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,389 psi | 85% | 2326 fps | 97.5% |
| Bofors RP3 | <<locked>> | 82% | 35,592 psi | 88% | 2277 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 82% | 36,477 psi | 90% | 2277 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 34,853 psi | 86% | 2277 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,940 psi | 86% | 1509 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 36,129 psi | 89% | 2234 fps | 97.2% |
| IMR 4831 | <<locked>> | 94% | 34,679 psi | 85% | 2287 fps | 96.1% |
| Norma URP | <<locked>> | 90% | 35,694 psi | 88% | 2313 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,404 psi | 87% | 1549 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 35,302 psi | 87% | 2352 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 35,534 psi | 88% | 2270 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 34,490 psi | 85% | 2270 fps | 97.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 36,361 psi | 90% | 2185 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 34,330 psi | 85% | 2231 fps | 97.7% |
| Somchem S365 | <<locked>> | 94% | 36,158 psi | 89% | 2365 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 88% | 35,288 psi | 87% | 2234 fps | 99% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,709 psi | 90% | 2395 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 35,433 psi | 87% | 2254 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 30,676 psi | 76% | 2303 fps | 96.4% |
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>> | 88% | 32,706 psi | 81% | 2264 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,852 psi | 83% | 2228 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 33,779 psi | 83% | 2274 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,196 psi | 72% | 2192 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 28,877 psi | 71% | 2185 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 33,141 psi | 82% | 2228 fps | 97.9% |
| Hodgdon H380 | <<locked>> | 80% | 34,301 psi | 84% | 2231 fps | 95.1% |
| Hodgdon Hybrid 100V | 34.9 gr | 86% | 29,066 psi | 72% | 2139 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,034 psi | 64% | 1348 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,968 psi | 84% | 2188 fps | 96.6% |
| IMR 4831 | <<locked>> | 92% | 32,561 psi | 80% | 2241 fps | 95.3% |
| Norma URP | <<locked>> | 88% | 33,576 psi | 83% | 2267 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,252 psi | 65% | 1381 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,125 psi | 77% | 2254 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 80% | 31,285 psi | 77% | 2178 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,227 psi | 79% | 2221 fps | 96.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,127 psi | 84% | 2146 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 32,242 psi | 79% | 2185 fps | 97% |
| Somchem S365 | 35 gr | 84% | 26,368 psi | 65% | 2123 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 80% | 27,630 psi | 68% | 2064 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 94% | 30,284 psi | 75% | 2247 fps | 95% |
| Winchester 6.5 StaBALL | 37 gr | 82% | 29,211 psi | 72% | 2110 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 98% | 28,761 psi | 71% | 2244 fps | 95.1% |
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 23 powders for 7 x 72 R loaded with the .284 | 166gr | Peregrine VRG-2. Vihtavuori N555 delivers the highest muzzle velocity at 2,395 fps; across all powders the maximum-charge window runs from 1,509 fps to 2,395 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 23 of the 23 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 76–90 %, leaving at least 10 % headroom. The 166.0 gr projectile in 0.284" calls for a 1:11.0 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, Hodgdon Hybrid 100V, Winchester 6.5 StaBALL rank at the top here: for 7 x 72 R with the .284 | 166gr | Peregrine VRG-2 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.