I find that I usually have first shots high when the barrel is cold and clean. It takes at least one shot to foul the barrel, sometimes 2, then my Savages lock in and shoot great. I zero my scope for the shots that group and don't get excited about the first one.
If all the other shots are grouping, you may be seeing the same effect.
If a cold, fouled barrel shoots high and then the next shots are all shoot low, then if you are using if for hunting, then you better be sure the rifle is sighted in on a cold barrel.
If you're target shooting and the first shot is always high out of a cold barrel, that is what sighters are for.
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