I'm new to high powered rifle shooting and hopefully I haven't overlooked this question being asked before, but what kind of p.o.i. changes are common between shots as the barrel is warming up? I'm asking because I have shot a savage le package before and the first shot of the day is usually 1.5-2.5 inches off of where the rest of the shots are and I don't know if it is similar with all rifles. Also, the rifle had quite a lot of oil in the bore so could it possibly be because it is blowing the oil out on the first shot? Thanks for any info.