Load Specifications
Load data in caliber 5.6 x 70 R with .224 | 50gr | Speer TNT 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 |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 33,823 psi | 90% | 3045 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,228 psi | 88% | 2231 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,170 psi | 88% | 2277 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 32,256 psi | 86% | 3002 fps | 97% |
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 2495 | <<locked>> | 82% | 29,283 psi | 78% | 2913 fps | 95.9% |
| Hodgdon TrailBoss | 9.4 gr | 80% | 24,613 psi | 65% | 2008 fps | 100% |
| ReloadSwiss RS 14 | 9.5 gr | 80% | 24,337 psi | 65% | 2047 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 27,891 psi | 74% | 2871 fps | 95% |
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 14 powders for 5.6 x 70 R loaded with the .224 | 50gr | Speer TNT. IMR 3031 delivers the highest muzzle velocity at 3,064 fps; across all powders the maximum-charge window runs from 2,231 fps to 3,064 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 14 of the 14 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 84–90 %, leaving at least 10 % headroom. The 50.0 gr projectile in 0.224" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. 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. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 5.6 x 70 R with the .224 | 50gr | Speer TNT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 4064, Hodgdon BL-C2, Lovex D073.6 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.