GECO · Hunting

GECO EXPRESS 8x57 IS 11,7g

0.373BC (G1)

180.0gr11.66 g

798m/s2618 fps

3714J2739 ft·lb

Manufacturer	GECO
Calibre	8.22 mm (.324")
Bullet weight	180.0 gr · 11.66 g
Ballistic coefficient G1	0.373
Ballistic coefficient G7	not published
Drag model used	G1
Muzzle velocity	798.0 m/s · 2618 fps
Muzzle energy	3714 J · 2739 ft·lb
Sectional density	0.246
Form factor	i1 0.658
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 3714 J (2739 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 44 loads of this bore diameter in the database, this one's G1 BC of 0.373 is higher than 40 of them.

Similar 8.22 mm (.324") loads

GECO EXPRESS 8x57 IRS 11,7g180 gr · BC 0.251 · 836 m/s 8×57 IRS loaded with the 11.7 g (180 gr) Naturalis lead-free copper bullet – The wild b...180 gr · BC 0.179 · 805 m/s Norma TIPSTRIKE 8x57 JRS 11,7g180 gr · BC 0.361 · 760 m/s Norma TIPSTRIKE 8x57 JS 11,7g180 gr · BC 0.361 · 800 m/s 8 × 57 JRS EDGE 180 gr (Rifle ammunition with eXergy Edge bullets)180 gr · BC 0.165 · 759 m/s 8 × 57 JRS TXRG 180 gr (Rifle ammunition with eXergy Blue bullets)180 gr · BC 0.202 · 759 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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