Any tips on becoming a better aim?

[CharlesHarris]

If you are not able to spend more time at the range, "dry firing" to practice grip, sight alignment, breathing and trigger control is a great help. If you are able to practice indoors with an air rifle or pistol, this is helpful. Outdoor, longer range shooting helps to learn to judge wind, etc., but if you can practice indoors in your attic or cellar at small targets which require precision, this is what you want. One you can hit a target the size of a pea with an precision air rifle at 10 metres with some regularity, you can hit the bunnie's eye at the same distance and feed yourself.

A catapault is also good training.