Air rifle (600-700 fps or less) in the basement or backyard with a similar scope. That will magnify any and all errors you have with position shooting.

Its the best investment a Silhouette or High Power shooter can make.

The 10/22 at 50 meters isnt a bad option either, but to make the target size close you will be shooting at a 2x4 target. Wind can/will kick a 22lr butt.