I've only had the scope out twice on the range so far but I've had no problems with consistency out to 55. The difference between 50 & 55 on the sidewheel is fairly tight even on the 100mm sidewheel, no more than a couple of mm. So accurate rangefinding (and differentiation) between 50 & 55 is possible but takes a fair bit of care.
Graduations at the top end go 35, 50, 100 etc so it's essential to tape up if you want 100% repeatable results, especially 35yds+
A larger sidewheel would of course help (I'm wondering if the big MTC wheel would fit but I don't know what the internal diameter is on them.)
HTH