Load Specifications
Load data in caliber 7 x 72 R with .284 | 145gr | Speer Grand Slam bullet and 20 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Vihtavuori N150 and ReloadSwiss RS 14.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 82% | 34,809 psi | 86% | 2418 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 36,434 psi | 90% | 2454 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 88% | 35,969 psi | 89% | 2523 fps | 96.7% |
| Bofors RP3 | <<locked>> | 84% | 35,766 psi | 88% | 2454 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 35,230 psi | 87% | 2448 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,664 psi | 85% | 1637 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 36,347 psi | 90% | 2408 fps | 96% |
| Lovex S062 | <<locked>> | 82% | 36,361 psi | 90% | 2421 fps | 97.9% |
| Norma 203B | <<locked>> | 82% | 36,172 psi | 89% | 2451 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 82% | 35,723 psi | 88% | 2461 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,027 psi | 86% | 1677 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 35,795 psi | 88% | 2530 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 86% | 35,926 psi | 88% | 2451 fps | 97.2% |
| Shooters World Precision | <<locked>> | 82% | 36,361 psi | 90% | 2421 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 34,838 psi | 86% | 2448 fps | 95.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 34,519 psi | 85% | 2323 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 34,722 psi | 86% | 2408 fps | 96.6% |
| Somchem S365 | <<locked>> | 96% | 36,419 psi | 90% | 2543 fps | 98.4% |
| Vihtavuori N150 | <<locked>> | 90% | 35,534 psi | 88% | 2408 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 36,042 psi | 89% | 2425 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 4064 | <<locked>> | 80% | 32,808 psi | 81% | 2375 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,836 psi | 78% | 2349 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 86% | 33,576 psi | 83% | 2464 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 31,256 psi | 77% | 2349 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 33,040 psi | 81% | 2395 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,701 psi | 63% | 1460 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,287 psi | 84% | 2362 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 34,316 psi | 85% | 2375 fps | 97.3% |
| Norma 203B | <<locked>> | 80% | 33,881 psi | 83% | 2398 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 33,301 psi | 82% | 2402 fps | 95.1% |
| ReloadSwiss RS 14 | 12.2 gr | 80% | 26,121 psi | 64% | 1499 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,602 psi | 73% | 2365 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 82% | 31,386 psi | 77% | 2346 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 34,316 psi | 85% | 2375 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,721 psi | 81% | 2395 fps | 95% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,474 psi | 80% | 2277 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 30,676 psi | 76% | 2310 fps | 95% |
| Somchem S365 | 38.8 gr | 88% | 28,398 psi | 70% | 2333 fps | 95.2% |
| Vihtavuori N150 | 34.3 gr | 82% | 27,789 psi | 68% | 2224 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,720 psi | 78% | 2323 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 42 powders for 7 x 72 R loaded with the .284 | 145gr | Speer Grand Slam. Alliant Reloder-26 delivers the highest muzzle velocity at 2,556 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,556 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 42 of the 42 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 1:13.0 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. Somchem S365, Vihtavuori N150, ReloadSwiss RS 14 rank at the top here: for 7 x 72 R with the .284 | 145gr | Speer Grand Slam 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-26 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.