GECO · Hunting

GECO STAR 7x64 9,1g

0.220BC (G1)

140.0gr9.07 g

928m/s3045 fps

3906J2881 ft·lb

Manufacturer	GECO
Calibre	7.21 mm (.284")
Bullet weight	140.0 gr · 9.07 g
Ballistic coefficient G1	0.220
Ballistic coefficient G7	not published
Drag model used	G1
Muzzle velocity	928.0 m/s · 3045 fps
Muzzle energy	3906 J · 2881 ft·lb
Sectional density	0.248
Form factor	i1 1.128
Category	Hunting
Source	GECO 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 3906 J (2881 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.248 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 0.220 is higher than 24 of them.

Similar 7.21 mm (.284") loads

Barnes TSX, 7mm-08 Rem, 140 Grain, Barnes Triple-Shock X Bullet (TSX), 2820 fps140 gr · BC 0.394 · 860 m/s Fusion Rifle, 7mm-08 Rem, 140 Grain, Fusion Soft Point, 2850 fps140 gr · BC 0.390 · 869 m/s Trophy Bonded Tip, 7mm-08 Rem, 140 Grain, Trophy Bonded Tip, 2800 fps140 gr · BC 0.430 · 853 m/s SAKO Rapid Expansion Series 7 mm 08 Rem. 9.1 g / 140 gr140 gr · BC 0.394 · 860 m/s Winchester Ballistic Silvertip 7mm-08 Remington 140 gr140 gr · BC 0.454 · 844 m/s Winchester Deer Season XP 7mm-08 Remington 140 gr140 gr · BC 0.484 · 853 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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