the 243 is a great weapon. My son has been shooting one for a few years. I started him off shooting 12" paper targets, and once he got over the flinches, and got his breathing right, i started using smaller targets.
Hitting a gong is fine and fun, but not really gonna be able to see his groupings on a peice of steel. Shoot as often as you can afford, muscle memory will help improve his shooting.
American by birth, Southern by the grace of God.