Marcel Matusik

Hi There. I am looking to find out what influence/s cold barrels, or temprature variances can have on accurracy or groups. I am shooting a Rem 700 SS Flutted barrel 26". I use Lapua brass with 168g Sierra Match King heads. Self Loaded with exact Ogive measurements, and powder weight. Is there any good reading on this topic, that you could refer me too? Many Thanks!