Barnes TSX, 7mm-08 Rem, 140 Grain, Barnes Triple-Shock X Bullet (TSX), 2820 fps
| Manufacturer | Federal |
|---|---|
| Calibre | 7.21 mm (.284") |
| Bullet weight | 140.0 gr · 9.07 g |
| Ballistic coefficient G1 | 0.394 |
| Ballistic coefficient G7 | not published |
| Drag model used | G1 |
| Muzzle velocity | 859.5 m/s · 2820 fps |
| Muzzle energy | 3351 J · 2471 ft·lb |
| Sectional density | 0.248 |
| Form factor | i1 0.630 |
| Category | Rifle |
| Source | Federal website 2026-07-02 (verified) |
Reading these numbers
Only a G1 ballistic coefficient is published for this load, so BallisticApp solves it against the G1 drag table. G1 BC drifts with velocity — the figure below is valid near the muzzle and drops off as the bullet slows.
Muzzle energy of 3351 J (2471 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.248 describes weight per unit of frontal area; divided by the ballistic coefficient it gives the form factor, which is how much drag the shape adds over the standard projectile.
Among the 177 loads of this bore diameter in the database, this one's G1 BC of 0.394 is higher than 106 of them.
Similar 7.21 mm (.284") loads
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