7 × 57 R HPC 158 gr (Rifle ammunition HPC)
| Manufacturer | Sellier & Bellot |
|---|---|
| Calibre | 7.21 mm (.284") |
| Bullet weight | 158.0 gr · 10.24 g |
| Ballistic coefficient G1 | 0.607 |
| Ballistic coefficient G7 | 0.305 |
| Drag model used | G7 |
| Muzzle velocity | 757.0 m/s · 2484 fps |
| Muzzle energy | 2934 J · 2164 ft·lb |
| Sectional density | 0.280 |
| Form factor | i7 0.918 · i1 0.461 |
| Category | Hunting |
| Source | Sellier & Bellot website 2026-07-02 (verified) |
Reading these numbers
Both a G1 and a G7 ballistic coefficient are published for this bullet. BallisticApp defaults to G7, because the G7 standard projectile is shaped like a modern boat-tail bullet and holds its coefficient far more steadily across the transonic range than G1 does.
Muzzle energy of 2934 J (2164 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.280 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 G7 BC of 0.305 is higher than 52 of them.
Similar 7.21 mm (.284") loads
Turn this into a drop table for your rifle.
These figures are the bullet's starting point. What you actually dial depends on your rifle's zero, the air you're shooting in and the wind on the day — BallisticApp solves that on the phone, offline, using the same G1/G7 tables and this database.
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