As far as OAL are you going from base to bullet tip? The Hornady bullet comparator measures the Ogive of the bullet because tips can be inconsistent. The ogive of each bullet can vary with different lots too so there’s that. My pet peeve is when people ask for me to load for them but don’t mention anything about ponying up any$$ or even coming over to learn how. Or one of my friends wanted me to look into equipment they should get because they wanted to try it. They never got back to me about it and now I have a bunch of his brass I’m not gonna load