We've got an old 78 Remington that has had the same 4x Bushnell on it for 20 years. I cut it down to fit the Missus a long time ago and she's never wanted a better scope. Every year, I fold an envelope into a 3x3 square, staple it onto plain cardboard and fire three shots at it from 200 yards, from a rest. I can see the cross-hairs against the envelope and it gives me a good zero check.
This year I only hit it twice, near the middle, and frayed the edge with the other shot. Guess I am getting old.