Norma · Magnum

Norma Solid .416 Rigby 25.9g

0.247BC (G1)

400.0gr25.92 g

725m/s2379 fps

6812J5024 ft·lb

Manufacturer	Norma
Calibre	10.57 mm (.416")
Bullet weight	400.0 gr · 25.92 g
Ballistic coefficient G1	0.247
Ballistic coefficient G7	not published
Drag model used	G1
Muzzle velocity	725.0 m/s · 2379 fps
Muzzle energy	6812 J · 5024 ft·lb
Sectional density	0.330
Form factor	i1 1.336
Category	Magnum
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 6812 J (5024 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.330 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 11 loads of this bore diameter in the database, this one's G1 BC of 0.247 is higher than 0 of them.

Similar 10.57 mm (.416") loads

Safari Swift A-Frame, 416 Rigby, 400 Grain, Swift A-Frame, 2350 fps400 gr · BC 0.367 · 716 m/s Safari Trophy Bonded Bear Claw, 416 Rigby, 400 Grain, Trophy Bonded Bear Claw, 2300 fps400 gr · BC 0.374 · 701 m/s Safari Trophy Bonded Sledgehammer Solid, 416 Rigby, 400 Grain, Trophy Bonded Sledgehamm...400 gr · BC 0.273 · 722 m/s 416 Rem Mag 400 GR DGS®400 gr · BC 0.319 · 732 m/s 416 Rigby 400 gr DGS®400 gr · BC 0.319 · 736 m/s 416 Rigby 400 gr DGX® Bonded400 gr · BC 0.319 · 736 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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