Load Specifications
Load data in caliber 7 x 72 R with .284 | 140gr | Alaska Bullet Works Kodiak SP SPBC 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% | 35,360 psi | 87% | 2444 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 35,447 psi | 87% | 2470 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 34,766 psi | 86% | 2454 fps | 96.6% |
| Bofors RP3 | <<locked>> | 86% | 36,463 psi | 90% | 2507 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 35,824 psi | 88% | 2493 fps | 96.1% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 35,563 psi | 88% | 2507 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,606 psi | 85% | 1660 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 35,665 psi | 88% | 2441 fps | 96.3% |
| IMR 3031 | <<locked>> | 82% | 35,404 psi | 87% | 2487 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 36,042 psi | 89% | 2493 fps | 96% |
| Lovex S062 | <<locked>> | 82% | 35,085 psi | 86% | 2431 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,925 psi | 86% | 1703 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 34,403 psi | 85% | 2530 fps | 98% |
| Rottweil R 903 | <<locked>> | 88% | 36,637 psi | 90% | 2503 fps | 96.9% |
| Shooters World Precision | <<locked>> | 82% | 35,085 psi | 86% | 2431 fps | 97.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 35,404 psi | 87% | 2379 fps | 99.6% |
| Somchem S355 | <<locked>> | 86% | 35,491 psi | 87% | 2461 fps | 96.3% |
| Somchem S365 | <<locked>> | 96% | 34,882 psi | 86% | 2539 fps | 97.4% |
| Vihtavuori N135 | <<locked>> | 82% | 35,723 psi | 88% | 2444 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 36,114 psi | 89% | 2438 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 92% | 36,318 psi | 89% | 2461 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 82% | 35,810 psi | 88% | 2454 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 2495 | <<locked>> | 80% | 32,967 psi | 81% | 2395 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 31,198 psi | 77% | 2375 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,589 psi | 75% | 2356 fps | 95% |
| Bofors RP3 | <<locked>> | 82% | 31,821 psi | 78% | 2402 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 33,808 psi | 83% | 2444 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,330 psi | 82% | 2451 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,556 psi | 63% | 1480 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 33,417 psi | 82% | 2388 fps | 95.5% |
| IMR 3031 | <<locked>> | 80% | 33,228 psi | 82% | 2441 fps | 99.7% |
| IMR 4895 | <<locked>> | 80% | 33,982 psi | 84% | 2444 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 32,822 psi | 81% | 2379 fps | 96.3% |
| ReloadSwiss RS 14 | 12 gr | 80% | 25,672 psi | 63% | 1516 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,427 psi | 70% | 2359 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 84% | 31,981 psi | 79% | 2398 fps | 95.3% |
| Shooters World Precision | <<locked>> | 80% | 32,822 psi | 81% | 2379 fps | 96.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,372 psi | 77% | 2290 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 33,185 psi | 82% | 2408 fps | 95.5% |
| Somchem S365 | 40.1 gr | 92% | 30,676 psi | 76% | 2428 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 33,576 psi | 83% | 2398 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,040 psi | 84% | 2392 fps | 99.1% |
| Vihtavuori N150 | 34.7 gr | 84% | 28,166 psi | 69% | 2267 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 33,779 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 47 powders for 7 x 72 R loaded with the .284 | 140gr | Alaska Bullet Works Kodiak SP SPBC. ReloadSwiss RS 52 delivers the highest muzzle velocity at 2,552 fps; across all powders the maximum-charge window runs from 1,660 fps to 2,552 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (280 MPa), the top charges use 77–90 %, 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 | Alaska Bullet Works Kodiak SP SPBC 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.