Load Specifications
Load data in caliber 7 x 72 R with .284 | 175gr | Speer TBBC bullet and 26 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, Somchem S365 and Accurate 4350.
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% | 35,215 psi | 87% | 2238 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 36,347 psi | 90% | 2201 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,201 psi | 89% | 2254 fps | 96.8% |
| Alliant Reloder-17 | <<locked>> | 86% | 35,636 psi | 88% | 2274 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,476 psi | 85% | 2254 fps | 97.8% |
| Bofors RP3 | <<locked>> | 82% | 35,781 psi | 88% | 2205 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 82% | 36,695 psi | 90% | 2205 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 35,070 psi | 86% | 2201 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,157 psi | 87% | 1453 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 36,260 psi | 89% | 2159 fps | 97.5% |
| IMR 4831 | <<locked>> | 94% | 34,911 psi | 86% | 2215 fps | 96.5% |
| Norma URP | <<locked>> | 90% | 35,853 psi | 88% | 2241 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,346 psi | 87% | 1486 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 35,447 psi | 87% | 2277 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,114 psi | 86% | 2254 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 84% | 35,708 psi | 88% | 2195 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 34,708 psi | 85% | 2201 fps | 97.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 36,463 psi | 90% | 2110 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 34,635 psi | 85% | 2162 fps | 98% |
| Somchem S365 | <<locked>> | 94% | 36,332 psi | 89% | 2290 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 88% | 35,418 psi | 87% | 2159 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 86% | 34,519 psi | 85% | 2175 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 86% | 34,911 psi | 86% | 2221 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 98% | 34,519 psi | 85% | 2270 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 35,607 psi | 88% | 2182 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 30,777 psi | 76% | 2234 fps | 97% |
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 | 35.2 gr | 88% | 32,895 psi | 81% | 2192 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,084 psi | 84% | 2156 fps | 98.3% |
| Alliant Reloder-16 | 33.5 gr | 86% | 32,010 psi | 79% | 2159 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,399 psi | 72% | 2123 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 94% | 28,979 psi | 71% | 2119 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 33,504 psi | 83% | 2159 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 80% | 34,447 psi | 85% | 2159 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 27,441 psi | 68% | 2024 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,165 psi | 64% | 1296 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,040 psi | 84% | 2113 fps | 96.9% |
| IMR 4831 | <<locked>> | 90% | 30,951 psi | 76% | 2129 fps | 95% |
| Norma URP | <<locked>> | 88% | 33,663 psi | 83% | 2195 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,426 psi | 65% | 1329 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,328 psi | 77% | 2182 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 32,967 psi | 81% | 2208 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 31,560 psi | 78% | 2113 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,343 psi | 80% | 2149 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,476 psi | 85% | 2077 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 32,503 psi | 80% | 2116 fps | 97.4% |
| Somchem S365 | 32.6 gr | 82% | 24,932 psi | 61% | 2011 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 27,731 psi | 68% | 1995 fps | 97.2% |
| Vihtavuori N160 | <<locked>> | 84% | 32,401 psi | 80% | 2129 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 84% | 32,518 psi | 80% | 2169 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 94% | 30,647 psi | 75% | 2185 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 27,470 psi | 68% | 1995 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 28,964 psi | 71% | 2182 fps | 95.8% |
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 49 powders for 7 x 72 R loaded with the .284 | 175gr | Speer TBBC. Alliant Reloder-26 delivers the highest muzzle velocity at 2,320 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,320 fps. Accurate 3100 gives the best case fill at 100 %, and 49 of the 49 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 175.0 gr projectile in 0.284" calls for a 1:10.5 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. Alliant Reloder-16, Somchem S365, Accurate 4350 rank at the top here: for 7 x 72 R with the .284 | 175gr | Speer TBBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2700, Accurate 3100, 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.