Lux.
That long barrel handles hyper velocity .22lr (1640fps rate - CCI quick shots are amazing) better than just about anything out there. Hard to find that ammo right now, but it has a big advantage once you start reaching out a bit because of the flat trajectory.
Zero at 25 yards = .5" high at 50 yards = zero at 75 yards = 1" low at 100 yards... (I spent a lot of time playing with that ammo at different ranges to confirm that)
The rifle itself will shoot that ammo under 3/4" groups at 75 yards, and a little over 1" at 100 yards.
But the main thing, if you're shooting silhouettes, is the flat trajectory - makes point-shooting a lot easier.
That ammo is too fast for any of my shorter barrel rifles to stabilize properly, and all the carbines tend to have huge groups with it (like, 1" at 25 yards).