"Sorry in advance if this is a newb question."
it is a newb question and that's sorta what we're here for, no apology needed.
Your confusion is understandable, few loading books, if any, really deal with the question very well. Fact is, the book OAL is simply what they used to develop their data AND what should work smoothly in most commercial rifles. It's no more a law to be followed than their powder charges are, all are suggestions that WE must carefully check on as we develop our own versions of their loads.
Your rifle is a bolt action and, for now, you ONLY know what the max possible OAL for it is, you don't know a thing about what your best shooting OAL is. Most factory sporting rifles seem to shoot best from .025" off the lands to as much as four times that much.
My .22-250 shoots my best load from about .025" to .035" off the lands so I load .030" off and minor variations either way makes not a bit of difference on target. But, my rifle and load isn't yours so YOU will have to do the experimenting needed to find the best OAL window for your rig and load.