If done properly, including the bore, IMHO your buddy is full of baloney and I've been shooting/hunting for 63 years. A lot of centerfire rifles will throw a flyer on the first shot with a clean barrel if a dry patch isn't run through first. The last time I go to the range and shoot any rifle that I'm taking hunting I don't clean the bore until the hunting is over and sometimes that's a couple months unless they get wet. I've never heard anyone even talk about a flyer when talking a 22LR.