I have a Czech .177 air rifle, dont recall the brand. Its the typical one pump break action type and is capable of 2” groups at 50 yards. BUT you really have to lock into an extremely solid, bench style hold! Remember that that big ‘ol piston and spring have to jump forward with tremendous force before that little’ol pellet even starts to move. FOLLOW THROUGH IS VITAL for accuracy. If you aren’t locked firmly on target the barrel wont be pointing anywhere near the target when the pellet finally leaves the barrel.
This is a recent sighting in target, distances in yards. Prone position.