I just used one CATs target. I don't see the advantage of using more than one target. The most important part is making sure the target is EXACTLY 100 yards away from the scope objective and that the target is perfectly flat. I stretched and stapled one on a sheet of plywood.
All three scopes tracked dead on, but the Swaro is actually calibrated in 1/4" and not 1/4 MOA. They are not exactly the same thing. You are going to love having the adjustments match the reticle.