By the time you figure in shipping to and from, your 1/4-1/2 way to just buying a full set.
They are only $40-50 for the full set of Go,No Go, Field, honestly you really just need a field. So you can get that for like $20.
You could Also use the old tape on a case method, seeing as your just checking the distance from the face of the rim to the back of the case. You just need to manage to make a Field Gage which most places have around .072-.075" thickness depending on the manufacturer, So just stick some tape on the back of a case until your near that range, and assume it will compress a little, so if anything it would be ok to be a couple thousands over, and test it. Or check your washers, some people have found washers that were the right thickness and just used those.