Hornady · Rifle

7mm‑08 Rem 139 gr SST® Superformance®

0.486BC (G1)

139.0gr9.01 g

899m/s2950 fps

3641J2686 ft·lb

Manufacturer	Hornady
Calibre	7.21 mm (.284")
Bullet weight	139.0 gr · 9.01 g
Ballistic coefficient G1	0.486
Ballistic coefficient G7	not published
Drag model used	G1
Muzzle velocity	899.2 m/s · 2950 fps
Muzzle energy	3641 J · 2686 ft·lb
Sectional density	0.246
Form factor	i1 0.507
Category	Rifle
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 3641 J (2686 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.246 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 0.486 is higher than 137 of them.

Similar 7.21 mm (.284") loads

7mm‑08 Rem 139 gr InterLock® SP American Whitetail®139 gr · BC 0.392 · 866 m/s 7mm‑08 Rem 139 gr SST® American Whitetail® TIPPED139 gr · BC 0.486 · 872 m/s 7mm‑08 Rem 139 gr. CX® Superformance®139 gr · BC 0.429 · 887 m/s 7mm Rem Mag 139 gr InterLock® SP American Whitetail®139 gr · BC 0.392 · 960 m/s 7mm Rem Mag 139 gr SST® Superformance®139 gr · BC 0.486 · 988 m/s Barnes TSX, 7mm-08 Rem, 140 Grain, Barnes Triple-Shock X Bullet (TSX), 2820 fps140 gr · BC 0.394 · 860 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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