Two schools of thought on this.
One is to clean the bore, shoot a "clean" shot, then clean it again and shoot another "clean" shot. Repeat until you have a 5 shot group. In theory, they should all be printing at the same location - and there's you're "cold shot" with a clean bore.
The other school of thought is to take a couple fouling shots before putting the rifle away, making sure the last one is on target, and the barrel isn't hot. Then, you're on target with a "cold shot", albeit with a dirty bore.
I have done it both ways, and I remain loyal to the dirty bore. For one, I don't get a good consistent shot from a clean bore, and second, I don't leave my guns where rust would be a problem with a dirty gun.
Do it both ways and see what you come up with - experience is a better teacher on this than a range expert. YMMV