Ballistic data for your favourite calculator — K31 + GP11 ord.

BC G7 (recommended): 0.274
BC G1: 0.545
Bullet length: 35 mm
Bullet weight: 11.3g / 174gr
Rifling twist: right 270 mm (~10.63″)

GP11 old batches (20 century production)
V0: 780 m/s @ 7°C
V0 variation: 1.08 m/s / 1°C

GP11 new batches (21 century production)
V0: 768 m/s @ 7°C
V0 variation: 0.76 m/s / 1°C

Range cards for the typical chassis setup

Sight height: 70 mm
Zero range: 100 m
Cartridge: GP11 Ord.
Click value: 0.1 mrad


(Full user manual for the rangecards. Nota bene: the manual was written for the old cards design. The new is more exhaustive, more precise, and more compact, but the logic stays essentially the same.)