I'm wondering if there's a general-purpose tool for checking the shoulder-length (headspace) of bottle-neck rifle cases? Here's the situation. I own several old military bolt-action rifles. I'd like to check the headspace but don't want to buy a half-dozen headspace gages. For .223 and .308 I have case length gages that can measure the size of a fired case, which is a pretty good judge of headspace for all normal purposes. I also have an ogive gage, which is like a 1" hex nut with holes of different diameters drilled into the flats. I was wondering if anyone had something similar that could be slipped over neck of a rifle case and used with a caliper to get an idea of how much a case expands on firing? Sorry if this question is not exactly clear.