The 8-32x40 Bushnell is a great option for sliding-breech springer, if you don't mind front P/A
They are very long but slim, and the thickest part of the objective is past the loading port so, using high-ish mounts, loading is a doddle.
I have one on my 97K, in a Sportsmatch adjustable one-piece mount because they don't have a huge amount of built in adjustment. Paul James has the same setup and he does OK with it
Bottom rifle is the 97K with Bushnell 4200 8-32x40. Top is a 77K with Bushnell 6-40x40.