My march goes like a switch. Over a few degrees from around 24-25 to 27 degrees it will read 4 yds difference at 55yds... either side of that it's solid for perhaps 20 degrees, so down to about 4 and i've never had it above 35, so who knows?
The trick is to learn what it does and when. Not all scopes are the same. Some scopes appear to shift in a narrow bracket like a switch, others slowly wander, others appear not to shift, or not to a degree noticable over the range of temps the scope or user has seen.
BFTA/NSRA County Coach
CSFTA Chairman/BFTA Rep