I handload cartridges using methods/tools from basic to somewhat advanced, all according to what I want to accomplish at the time.

With a bit of experience, or guidance from someone who has been around the bench a few laps, you pick up tricks of the trade. For example, for a wide class of cartridges all you need if you want to measure shoulder bump is an empty piece of 40 S&W brass. Put the 40 case over the mouth of your 308, 30-06 or the like. Measure the whole shebang. Size your case. Measure again the same way. The difference is the bump, no fancy gauge needed.