GECO · Rifle

GECO DTX .223 Rem. 3,6g

0.302BC (G1)

55.0gr3.56 g

963m/s3159 fps

1653J1219 ft·lb

Manufacturer	GECO
Calibre	5.70 mm (.224")
Bullet weight	55.0 gr · 3.56 g
Ballistic coefficient G1	0.302
Ballistic coefficient G7	not published
Drag model used	G1
Muzzle velocity	963.0 m/s · 3159 fps
Muzzle energy	1653 J · 1219 ft·lb
Sectional density	0.156
Form factor	i1 0.517
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 1653 J (1219 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.156 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 206 loads of this bore diameter in the database, this one's G1 BC of 0.302 is higher than 184 of them.

Similar 5.70 mm (.224") loads

Barnes TSX, 223 Rem, 55 Grain, Barnes Triple-Shock X Bullet (TSX), 3200 fps55 gr · BC 0.209 · 975 m/s Federal Training, 223 Rem, 55 Grain, Full Metal Jacket, 3240 fps55 gr · BC 0.269 · 988 m/s Power-Shok Rifle, 22-250 Rem, 55 Grain, Jacketed Soft Point, 3650 fps55 gr · BC 0.208 · 1113 m/s Power-Shok Rifle, 223 Rem, 55 Grain, Jacketed Soft Point, 3240 fps55 gr · BC 0.222 · 988 m/s Trophy Copper, 223 Rem, 55 Grain, Trophy Copper, 3240 fps55 gr · BC 0.305 · 988 m/s Varmint & Predator, 22-250 Rem, 55 Grain, Hornady® V-Max®, 3670 fps55 gr · BC 0.255 · 1119 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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