ORIGINAL: rks1949
Be sure to try to seat the bullet(pressure the same every time,this will really help in group size. My Prohunter likes to have the bullet just seated firmly on the powder. If I use allot of pressure seating the bullet on the powder,it starts stringing the shots.
Agreed, that is one of the things I pay the most attention to is seating pressure.
The weather change can have an effect though you should see through out your group vs a stringing effect. Ie: now your shooting 2" low vs dead on!
It very well could have been an off day as well or bad rest so before you worry about switching, test some more and pay attention to detail.