First 2 years of ORPS I used a Talos 4-16 and never felt handicapped by the optic, often ran it at 10x all day
physical size was reasonable, power was more than adequate, + in center of reticle was not too large on orps size targets
I changed things up after shooting a few NRL22 with more difficult size and longer targets, but rarely dial power higher than 18-20x
as finding targets in the picture is better without too much power
A friend uses a Bushnell AR Optic , 4-18? maybe? they have dots and dial in mrad, good glass, 25 mm tube