Re: this may sound dumb but???
You can't argue with your Dad's results. Unless you have a super premium custom barrel, a couple or three fouling shots is customary.
I have a 222 that I can't remember the last time I "cleaned" it. I run a patch through it when I feel its necessary but that's about it. It hasn't changed POI, accuracy or anything else in that time. It still gets the yotes as far as a 222 is supposed to.
However, with my other guns that are for long range hunting I clean down to bare metal every 20 or 25 rounds. After break in and sighting in, 25 rounds may be a long time as the rifles are intended to shoot only game except for some major rock bustin'.
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!