Hornady · Hunting

303 British 150 gr InterLock® SP

0.361BC (G1)

150.0gr9.72 g

818m/s2685 fps

3255J2401 ft·lb

Manufacturer	Hornady
Calibre	7.90 mm (.311")
Bullet weight	150.0 gr · 9.72 g
Ballistic coefficient G1	0.361
Ballistic coefficient G7	not published
Drag model used	G1
Muzzle velocity	818.4 m/s · 2685 fps
Muzzle energy	3255 J · 2401 ft·lb
Sectional density	0.222
Form factor	i1 0.614
Category	Hunting
Source	Hornady 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 3255 J (2401 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.222 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 9 loads of this bore diameter in the database, this one's G1 BC of 0.361 is higher than 6 of them.

Similar 7.90 mm (.311") loads

Power-Shok Rifle, 303 British, 150 Grain, Jacketed Soft Point, 2690 fps150 gr · BC 0.356 · 820 m/s 303 BRITISH SP 150 gr (Rifle ammunition SP)150 gr · BC 0.156 · 809 m/s Power-Shok Rifle, 303 British, 180 Grain, Jacketed Soft Point, 2460 fps180 gr · BC 0.328 · 750 m/s 303 BRITISH FMJ 180 gr (Rifle ammunition FMJ)180 gr · BC 0.255 · 755 m/s 303 BRITISH FMJ 180 gr (Tactical Rifle Ammunition (FMJ))180 gr · BC 0.255 · 755 m/s 303 BRITISH SP 180 gr (Rifle ammunition SP)180 gr · BC 0.153 · 726 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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