The amount of fouling is not so much the issue, as if the fouling present affects your accuracy.
I had a friend who had a 270 Parker Hale that used to foul really bad after three shots, but it never affected the accuracy of that rifle until he shot it about 20 times.
Being a hunting rifle, he didn't worry about it, as he was a match shooter and had rifles he used to practice and compete with .
if you are shooting it at the range and see the accuracy drop off, just clean it there and keep shooting after 5 shots.
Cat