Maybe I'm misinterupting the point of "working the load up." I start a load at or near the minimum charge, after consulting several manuals. (Loads for the same caliber, bullet weight, primer and powder: One manual's minimum is at or near another manual's maximum. I can't cite a case offhand, but I have seen it.)
If the load shows no sign of overcharge, is reasonably accurate, and in the case of lead bullets, does not lead the barrel, I record the load and use it. I do not engage in working up a load in the sense of increasing the charge incrementally until I see signs of overpressure and then backing off. I don't own a chrono and am not concerned with velocity readings, frankly.
Am I missing a large piece of the hobby? Perhaps, but that's what I do and I have a lot of fun doing it. I feel that I am a competent reloader, not an expert, but competent, and I am very careful in my processes.
At my advanced middle age of 64 I tend to stick to the loads in my book, and not take the risk of a mental lapse.
Where was I? Oh, I work up NEW loads with new powders and different bullet weights but I don't try to determine the hottest load for a given gun and stuff like that. I can't even find my foot, I'm not gonna stress my memory any more that it is already.