I was using MGIV RC glossy paper of uncertain age. I bought the filters used, and I don't know how old they are. I also got some Kodak variable-contrast filters. In the interest of not wasting paper I would like to test the effects of these filters, but I'm not sure how to proceed. I do have some new MGIV satin paper. I don't have a step wedge, but I have a Kodak Projection Print Scale.
The Kodak Projection Print Scale is not good enough. You either need a step tablet (stouffer) or a timer (an f/stop timer with 1/3 stop increments would work well). Anyway, the step tablet does it all in one exposure, any timer will require multiple exposures, which is frustrating.
I suggest to invest a few $ and call Stouffer. You can use it for many tests, not just this one.