Norma · Hunting

Norma Oryx 7x57 R 10.1g

0.330BC (G1)

156.0gr10.11 g

795m/s2608 fps

3194J2356 ft·lb

Manufacturer	Norma
Calibre	7.21 mm (.284")
Bullet weight	156.0 gr · 10.11 g
Ballistic coefficient G1	0.330
Ballistic coefficient G7	not published
Drag model used	G1
Muzzle velocity	795.0 m/s · 2608 fps
Muzzle energy	3194 J · 2356 ft·lb
Sectional density	0.277
Form factor	i1 0.838
Category	Hunting
Source	Norma 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 3194 J (2356 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.277 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 0.330 is higher than 70 of them.

Similar 7.21 mm (.284") loads

7x65r-leadfree-naturalis-hunting-cartridge-101g-156gr-n317323156 gr · BC 0.280 · 840 m/s The 7×64 loaded with the 10.1 g (156 gr) Naturalis leadfree hunting bullet156 gr · BC 0.280 · 840 m/s Norma Oryx 7x57 10.1g156 gr · BC 0.330 · 805 m/s Terminal Ascent, 7mm Backcountry, 155 Grain, Terminal Ascent, 3300 fps155 gr · BC 0.586 · 1006 m/s Terminal Ascent, 28 Nosler, 155 Grain, Terminal Ascent, 3200 fps155 gr · BC 0.586 · 975 m/s Terminal Ascent, 7MM PRC, 155 Grain, Terminal Ascent, 3100 fps155 gr · BC 0.586 · 945 m/s

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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