Load Specifications
Load data in caliber 7 x 72 R with .284 | 140gr | Sierra Pro-Hunter bullet and 22 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 2495 | <<locked>> | 82% | 35,534 psi | 88% | 2451 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 35,868 psi | 88% | 2484 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 35,186 psi | 87% | 2467 fps | 96.7% |
| Bofors RP3 | <<locked>> | 84% | 34,476 psi | 85% | 2464 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 36,172 psi | 89% | 2503 fps | 96.3% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 36,201 psi | 89% | 2523 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,635 psi | 85% | 1663 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 35,810 psi | 88% | 2448 fps | 96.4% |
| IMR 3031 | <<locked>> | 82% | 35,621 psi | 88% | 2493 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 36,434 psi | 90% | 2507 fps | 96.2% |
| Lovex S062 | <<locked>> | 82% | 35,201 psi | 87% | 2434 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,983 psi | 86% | 1706 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 34,693 psi | 85% | 2539 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 86% | 34,360 psi | 85% | 2457 fps | 96.3% |
| Shooters World Precision | <<locked>> | 82% | 35,201 psi | 87% | 2434 fps | 97.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 35,781 psi | 88% | 2385 fps | 99.7% |
| Somchem S355 | <<locked>> | 86% | 35,621 psi | 88% | 2467 fps | 96.4% |
| Somchem S365 | <<locked>> | 96% | 34,969 psi | 86% | 2546 fps | 97.5% |
| Vihtavuori N135 | <<locked>> | 82% | 35,926 psi | 88% | 2451 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 36,550 psi | 90% | 2448 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 92% | 36,434 psi | 90% | 2467 fps | 98% |
| Vihtavuori N540 | <<locked>> | 82% | 36,158 psi | 89% | 2464 fps | 99.2% |
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% | 33,156 psi | 82% | 2402 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 31,386 psi | 77% | 2382 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,763 psi | 76% | 2362 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 30,124 psi | 74% | 2359 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 33,924 psi | 84% | 2451 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 31,850 psi | 78% | 2418 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,657 psi | 63% | 1486 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 33,794 psi | 83% | 2402 fps | 95.7% |
| IMR 3031 | <<locked>> | 80% | 33,446 psi | 82% | 2448 fps | 99.8% |
| IMR 4895 | <<locked>> | 80% | 34,113 psi | 84% | 2451 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 33,011 psi | 81% | 2385 fps | 96.4% |
| ReloadSwiss RS 14 | 12.1 gr | 80% | 25,773 psi | 63% | 1519 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,514 psi | 70% | 2365 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 84% | 32,372 psi | 80% | 2408 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 33,011 psi | 81% | 2385 fps | 96.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,517 psi | 78% | 2293 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 33,591 psi | 83% | 2421 fps | 95.7% |
| Somchem S365 | 40.4 gr | 92% | 30,966 psi | 76% | 2441 fps | 95.9% |
| Vihtavuori N135 | <<locked>> | 80% | 33,779 psi | 83% | 2405 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,200 psi | 84% | 2398 fps | 99.1% |
| Vihtavuori N150 | 35 gr | 84% | 28,514 psi | 70% | 2280 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 33,924 psi | 84% | 2415 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 46 powders for 7 x 72 R loaded with the .284 | 140gr | Sierra Pro-Hunter. ReloadSwiss RS 62 delivers the highest muzzle velocity at 2,559 fps; across all powders the maximum-charge window runs from 1,663 fps to 2,559 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 78–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:12.5 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 | Sierra Pro-Hunter they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 4350, Alliant Power Pro 2000-MR, Alliant Reloder-16 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.