I find that a fixed 16 mag scope is just a perfect balance.
(FOV, size of 40mm kill at 55 yards, standers & kneelers, no twiddling with the mag ring)
It has a custom range-finding reticle fitted. Designed for FT.
So no optical anomalies, like heat haze, temperature shift, etc. to deal with.
The scope is a Falcon Menace 16x44 Metric, originally with Skeleton EMD reticle.