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Winchester · Hunting

Winchester Super X 45-70 Government 300 gr

0.283BC (G1)
300.0gr19.44 g
573m/s1880 fps
3191J2354 ft·lb
ManufacturerWinchester
Calibre11.63 mm (.458")
Bullet weight300.0 gr  ·  19.44 g
Ballistic coefficient G10.283
Ballistic coefficient G7not published
Drag model usedG1
Muzzle velocity573.0 m/s  ·  1880 fps
Muzzle energy3191 J  ·  2354 ft·lb
Sectional density0.204
Form factori1 0.722
CategoryHunting
SourceWinchester 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 3191 J (2354 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.204 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 0.283 is higher than 22 of them.

Similar 11.63 mm (.458") loads

Federal Subsonic, 45-70 Government, 300 Grain, Fusion Soft Point, 1000 fps300 gr · BC 0.290 · 305 m/sFederal Subsonic, 45-70 Government, 300 Grain, Target Soft Point, 1000 fps300 gr · BC 0.290 · 305 m/sFusion Rifle, 45-70 Government, 300 Grain, Fusion Soft Point, 1850 fps300 gr · BC 0.290 · 564 m/sHammerDown Rifle, 45-70 Government, 300 Grain, Bonded Soft Point, 1850 fps300 gr · BC 0.290 · 564 m/sHenry 250th Anniversary, 45-70 Government, 300 Grain, Hollow Point, 1850 fps300 gr · BC 0.289 · 564 m/sPower-Shok Rifle, 45-70 Government, 300 Grain, Jacketed Soft Point, 1850 fps300 gr · BC 0.289 · 564 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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