Load Specifications
Load data in caliber 5.6 x 70 R with .224 | 77gr | Sierra Tipped MatchKing bullet and 4 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 |
|---|---|---|---|---|---|---|
| Hodgdon TrailBoss | <<locked>> | 98% | 34,026 psi | 90% | 1795 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 96% | 33,489 psi | 89% | 1818 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 33,156 psi | 88% | 2612 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 82% | 32,764 psi | 87% | 2490 fps | 96.4% |
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 |
|---|---|---|---|---|---|---|
| Hodgdon TrailBoss | 8.6 gr | 80% | 25,759 psi | 68% | 1617 fps | 100% |
| ReloadSwiss RS 14 | 8.8 gr | 80% | 26,136 psi | 69% | 1660 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 31,227 psi | 83% | 2556 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 30,443 psi | 81% | 2431 fps | 95.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 19 powders for 5.6 x 70 R loaded with the .224 | 77gr | Sierra Tipped MatchKing. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,612 fps; across all powders the maximum-charge window runs from 1,795 fps to 2,612 fps. Winchester StaBALL HD gives the best case fill at 100 %, and 19 of the 19 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 83–90 %, leaving at least 10 % headroom. The 77.0 gr projectile in 0.224" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Winchester StaBALL HD 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. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 5.6 x 70 R with the .224 | 77gr | Sierra Tipped MatchKing 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-17 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.