Load Specifications
Load data in caliber 7 x 72 R with .284 | 145gr | Speer Boat-Tail bullet and 22 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, Somchem S365 and Vihtavuori N150.
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 2495 | <<locked>> | 82% | 36,608 psi | 90% | 2428 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 34,577 psi | 85% | 2415 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 36,158 psi | 89% | 2448 fps | 97.4% |
| Alliant Reloder-15 | <<locked>> | 82% | 36,564 psi | 90% | 2454 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 88% | 35,795 psi | 88% | 2516 fps | 96.6% |
| Bofors RP3 | <<locked>> | 84% | 35,505 psi | 87% | 2448 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 35,041 psi | 86% | 2441 fps | 96.4% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 34,838 psi | 86% | 2451 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,563 psi | 85% | 1634 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 36,376 psi | 90% | 2405 fps | 95.9% |
| Lovex S062 | <<locked>> | 82% | 36,100 psi | 89% | 2415 fps | 97.8% |
| Norma 203B | <<locked>> | 82% | 35,897 psi | 88% | 2444 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 82% | 35,505 psi | 87% | 2454 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,925 psi | 86% | 1673 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 35,607 psi | 88% | 2526 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 86% | 35,679 psi | 88% | 2444 fps | 97.1% |
| Shooters World Precision | <<locked>> | 82% | 36,100 psi | 89% | 2415 fps | 97.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 36,637 psi | 90% | 2362 fps | 99.9% |
| Somchem S355 | <<locked>> | 84% | 34,505 psi | 85% | 2402 fps | 96.5% |
| Somchem S365 | <<locked>> | 96% | 36,201 psi | 89% | 2536 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 90% | 35,288 psi | 87% | 2402 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 35,911 psi | 88% | 2421 fps | 96.8% |
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 2495 | <<locked>> | 80% | 34,447 psi | 85% | 2385 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 32,576 psi | 80% | 2369 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,865 psi | 78% | 2349 fps | 96% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,258 psi | 84% | 2402 fps | 95.1% |
| Alliant Reloder-17 | 39.7 gr | 86% | 33,402 psi | 82% | 2457 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 31,009 psi | 76% | 2343 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 32,851 psi | 81% | 2388 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,619 psi | 80% | 2398 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,846 psi | 64% | 1460 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,055 psi | 84% | 2356 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 34,055 psi | 84% | 2369 fps | 97.2% |
| Norma 203B | <<locked>> | 80% | 33,634 psi | 83% | 2392 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 33,083 psi | 81% | 2398 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,976 psi | 64% | 1496 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,443 psi | 73% | 2359 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 82% | 31,154 psi | 77% | 2339 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 34,055 psi | 84% | 2369 fps | 97.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,271 psi | 79% | 2274 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 32,285 psi | 80% | 2349 fps | 95.7% |
| Somchem S365 | 38.6 gr | 88% | 28,210 psi | 69% | 2326 fps | 95% |
| Vihtavuori N150 | 34.1 gr | 82% | 27,557 psi | 68% | 2215 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,589 psi | 78% | 2316 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 46 powders for 7 x 72 R loaded with the .284 | 145gr | Speer Boat-Tail. Alliant Reloder-26 delivers the highest muzzle velocity at 2,552 fps; across all powders the maximum-charge window runs from 1,634 fps to 2,552 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 46 of the 46 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 71–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, 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-17, Somchem S365, Vihtavuori N150 rank at the top here: for 7 x 72 R with the .284 | 145gr | Speer Boat-Tail they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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.