7,62 × 54 R FMJ 180 gr (Tactical Rifle Ammunition (FMJ))

Reading these numbers

Both a G1 and a G7 ballistic coefficient are published for this bullet. BallisticApp defaults to G7, because the G7 standard projectile is shaped like a modern boat-tail bullet and holds its coefficient far more steadily across the transonic range than G1 does.

Muzzle energy of 3603 J (2657 ft·lb) is computed from the bullet weight and muzzle velocity above, not quoted from the catalogue. Sectional density 0.269 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 8 loads of this bore diameter in the database, this one's G7 BC of 0.255 is higher than 3 of them.

Similar 7.85 mm (.309") loads