GECO · Rifle

GECO EXPRESS .243 Win. 4,9g

0.305BC (G1)

76.0gr4.92 g

1020m/s3346 fps

2562J1890 ft·lb

Manufacturer	GECO
Calibre	6.17 mm (.243")
Bullet weight	76.0 gr · 4.92 g
Ballistic coefficient G1	0.305
Ballistic coefficient G7	not published
Drag model used	G1
Muzzle velocity	1020.0 m/s · 3346 fps
Muzzle energy	2562 J · 1890 ft·lb
Sectional density	0.184
Form factor	i1 0.603
Category	Rifle
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 2562 J (1890 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.184 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 71 loads of this bore diameter in the database, this one's G1 BC of 0.305 is higher than 30 of them.

Similar 6.17 mm (.243") loads

Norma TIPSTRIKE Varmint .243 Winchester 4.9g76 gr · BC 0.332 · 1050 m/s Norma VERMINXTREME 243 Winchester 4.9g76 gr · BC 0.147 · 1050 m/s Varmint & Predator, 243 Win, 75 Grain, Hornady® V-Max®, 3425 fps75 gr · BC 0.330 · 1044 m/s Varmint & Predator, 243 Win, 75 Grain, Jacketed Hollow Point, 3375 fps75 gr · BC 0.234 · 1029 m/s 243 WSSM 75 gr V‑MAX® Superformance® Varmint75 gr · BC 0.330 · 1079 m/s 243 Win 75 gr V‑MAX® Superformance® Varmint75 gr · BC 0.330 · 1091 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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