Following on from Mike Morton’s examination of airgun powerplants and velocities, he gives his top tips for working out shot count…
Shoot five-shot groups at a series of targets in as near-perfect conditions as you can get. These shots at 25 yards in light wind show a uniform point of impact.
The rifle was still punching a nice one-hole group from shot 150 to 155. It’s mentally draining to shoot accurately for an extended length of time, but necessary.
Shots 155 to 160 have printed an even better group, but the point of impact is just starting to come off the bull. This is a warning sign that we’ve hit the limit.
The group really started to open up after 160 shots, with shot 165 outside the group. Head back to the last reliable group to determine the maximum shot count.