Charadam - thanks for the reply, can rule expansion out.
Joe - my load is well within the limits so no worries on it being a hot load.
I am interested in peoples views if temperature deviation has an impact on reloading or if anyone has experience of it.
ATB 243 Stalker
Some powders are affected by the ambient temperature more than others.
I found Varget is stable/consistent at most temperatures where a change of 15 C can have an impact on Vhit powders.
I used to run a target load of 60grn V Max at 0.75grn under the max load with N133. I found that it showed pressure signs in hot weather, the POI shifted by over an inch and the groups opened up.
To resolve the problem but maintain the POI where I wanted it I dropped the charge by 0.5grn in hot weather, which wasn't much but it removed the pressure signs.
In cold weather the same load shot 0.5inch low, but the groups were excellent.