You can break your heart chasing mega-magnums all day long, or you can get an airgun that's known to be highly accurate.
These are my picks for top accuracy:
Good ones make it easier to size groups and easier to aim. When properly sized, they help you improve your accuracy. On 10-meter rifle targets, the bull is sized for the aperture front sight inserts...bigger bulls are too large for those apertures. On 10-meter pistol targets, the bull is sized to the width of the front sight post on a target pistol. 10-meter rifle target 10-meter pistol target
At my old field target club, a local SWAT team sniper came out to "show us how it's done." Mr. SWAT just knew that he was a better shot than all the old duffers with their huge scopes. He scored in the middle of the pack and left with his tail between his legs. Others who have tried a similar approach have gone through progressively better springers until they finally settled on an accurate PCP. By that time, they were considerably better shots. Below are some blogs you can read about field target. Field target PCP rifles Field target scopes