Just been playing with it without shooting... today has probably seen the widest spread. DA has gone up from 480 to 1200 just now, seems humdity has played a part as that has dropped a lot even though the temp has only moved a few degrees.
The other day it dropped from 1300 to 750 as the sun went down and the evening cooled.
Early days, but it will be interesting to see what the DA is like when I do see a shift. Gonna take the springer up the range tonight and see what's what