Load Specifications
Load data in caliber 7 x 72 R with .284 | 140gr | Speer TBBC bullet and 21 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.
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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 84% | 35,984 psi | 89% | 2477 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 35,157 psi | 87% | 2461 fps | 96.7% |
| Bofors RP3 | <<locked>> | 84% | 34,519 psi | 85% | 2461 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 36,216 psi | 89% | 2497 fps | 96.2% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 35,491 psi | 87% | 2503 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,519 psi | 85% | 1657 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 35,592 psi | 88% | 2441 fps | 96.2% |
| IMR 3031 | <<locked>> | 82% | 35,766 psi | 88% | 2490 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 36,434 psi | 90% | 2497 fps | 96.1% |
| Lovex S062 | <<locked>> | 82% | 35,491 psi | 87% | 2434 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,882 psi | 86% | 1696 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 34,751 psi | 86% | 2533 fps | 98.1% |
| Rottweil R 903 | <<locked>> | 86% | 34,679 psi | 85% | 2454 fps | 96.3% |
| Shooters World Precision | <<locked>> | 82% | 35,491 psi | 87% | 2434 fps | 97.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 35,708 psi | 88% | 2379 fps | 99.6% |
| Somchem S355 | <<locked>> | 86% | 35,911 psi | 88% | 2467 fps | 96.4% |
| Somchem S365 | <<locked>> | 96% | 35,056 psi | 86% | 2539 fps | 97.5% |
| Vihtavuori N135 | <<locked>> | 86% | 34,679 psi | 85% | 2415 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 82% | 36,492 psi | 90% | 2441 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 92% | 36,434 psi | 90% | 2461 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 82% | 36,158 psi | 89% | 2457 fps | 99.1% |
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 4064 | <<locked>> | 80% | 31,749 psi | 78% | 2382 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,966 psi | 76% | 2359 fps | 95.1% |
| Bofors RP3 | <<locked>> | 82% | 32,285 psi | 80% | 2405 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 33,939 psi | 84% | 2444 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,257 psi | 82% | 2448 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,773 psi | 63% | 1483 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 33,315 psi | 82% | 2385 fps | 95.4% |
| IMR 3031 | <<locked>> | 80% | 33,605 psi | 83% | 2444 fps | 99.8% |
| IMR 4895 | <<locked>> | 80% | 34,360 psi | 85% | 2451 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 33,257 psi | 82% | 2382 fps | 96.5% |
| ReloadSwiss RS 14 | 12 gr | 80% | 25,918 psi | 64% | 1516 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,790 psi | 71% | 2362 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 84% | 32,445 psi | 80% | 2402 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 33,257 psi | 82% | 2382 fps | 96.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,691 psi | 78% | 2290 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 33,591 psi | 83% | 2411 fps | 95.6% |
| Somchem S365 | 40 gr | 92% | 31,111 psi | 77% | 2434 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 28,790 psi | 71% | 2280 fps | 99.1% |
| Vihtavuori N140 | <<locked>> | 80% | 34,403 psi | 85% | 2395 fps | 99.1% |
| Vihtavuori N150 | 34.6 gr | 84% | 28,514 psi | 70% | 2274 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 33,881 psi | 83% | 2408 fps | 98.7% |
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 45 powders for 7 x 72 R loaded with the .284 | 140gr | Speer TBBC. ReloadSwiss RS 62 delivers the highest muzzle velocity at 2,549 fps; across all powders the maximum-charge window runs from 1,657 fps to 2,549 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 45 of the 45 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 140.0 gr projectile in 0.284" calls for a 1:12.0 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, Vihtavuori N150, ReloadSwiss RS 14 rank at the top here: for 7 x 72 R with the .284 | 140gr | Speer TBBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 4350, ADI AR 2208, Alliant Power Pro 2000-MR 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.