Winchester · Hunting

Winchester Super X 45-70 Government 405 gr

0.280BC (G1)

405.0gr26.24 g

351m/s1150 fps

1612J1189 ft·lb

Manufacturer	Winchester
Calibre	11.63 mm (.458")
Bullet weight	405.0 gr · 26.24 g
Ballistic coefficient G1	0.280
Ballistic coefficient G7	not published
Drag model used	G1
Muzzle velocity	350.5 m/s · 1150 fps
Muzzle energy	1612 J · 1189 ft·lb
Sectional density	0.276
Form factor	i1 0.986
Category	Hunting
Source	Winchester 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 1612 J (1189 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.276 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 42 loads of this bore diameter in the database, this one's G1 BC of 0.280 is higher than 18 of them.

Similar 11.63 mm (.458") loads

45-70 GOVT. SP 405 gr (Rifle ammunition SP)405 gr · BC 0.199 · 460 m/s Winchester Rifle 45-70 Government 405 gr405 gr · BC 0.280 · 351 m/s Safari Trophy Bonded Bear Claw, 458 Win Magnum, 400 Grain, Trophy Bonded Bear Claw, 225...400 gr · BC 0.353 · 686 m/s 45‑70 Government 410 gr Sub‑X® Subsonic410 gr · BC 0.285 · 328 m/s 450 Bushmaster 395 gr Sub‑X® Subsonic395 gr · BC 0.300 · 320 m/s 450 Nitro Express 3 1/4" 480 gr DGS®480 gr · BC 0.285 · 655 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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