Load Specifications
Load data in caliber 5.6 x 70 R with .224 | 77gr | Barnes LRX BT bullet and 7 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 14 and Hodgdon TrailBoss.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 82% | 33,663 psi | 89% | 2546 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,591 psi | 89% | 1775 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,823 psi | 90% | 1814 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 32,938 psi | 87% | 2595 fps | 96.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 33,968 psi | 90% | 2464 fps | 99.1% |
| Somchem S365 | <<locked>> | 94% | 33,678 psi | 89% | 2612 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 84% | 32,329 psi | 86% | 2477 fps | 96% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 80% | 31,430 psi | 83% | 2490 fps | 98% |
| Hodgdon TrailBoss | 8.3 gr | 80% | 25,425 psi | 67% | 1601 fps | 100% |
| ReloadSwiss RS 14 | 8.5 gr | 80% | 25,730 psi | 68% | 1640 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 30,951 psi | 82% | 2539 fps | 95.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,763 psi | 84% | 2411 fps | 98.6% |
| Somchem S365 | <<locked>> | 92% | 31,589 psi | 84% | 2556 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 82% | 30,211 psi | 80% | 2425 fps | 95.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 7 powders for 5.6 x 70 R loaded with the .224 | 77gr | Barnes LRX BT. Somchem S365 delivers the highest muzzle velocity at 2,612 fps; across all powders the maximum-charge window runs from 1,775 fps to 2,612 fps. Hodgdon TrailBoss gives the best case fill at 98 %, and 7 of the 7 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 86–90 %, leaving at least 10 % headroom. The 77.0 gr projectile in 0.224" calls for a 1:7.0 twist; slower twists will usually not stabilise this weight. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 5.6 x 70 R with the .224 | 77gr | Barnes LRX BT they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.