SAKO · Hunting

SAKO Rapid Expansion Series 8 x 57 IRS 11.3 g / 174 gr

0.374BC (G1)

174.0gr11.28 g

775m/s2543 fps

3386J2497 ft·lb

Manufacturer	SAKO
Calibre	8.22 mm (.324")
Bullet weight	174.0 gr · 11.28 g
Ballistic coefficient G1	0.374
Ballistic coefficient G7	not published
Drag model used	G1
Muzzle velocity	775.0 m/s · 2543 fps
Muzzle energy	3386 J · 2497 ft·lb
Sectional density	0.237
Form factor	i1 0.635
Category	Hunting
Source	SAKO 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 3386 J (2497 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.237 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 0.374 is higher than 41 of them.

Similar 8.22 mm (.324") loads

GECO EXPRESS 8x57 IRS 11,7g180 gr · BC 0.251 · 836 m/s GECO EXPRESS 8x57 IS 11,7g180 gr · BC 0.373 · 798 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

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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