I have tried the Sage's plain base checks. They are aluminum, very thin, and have teeth on the sides, to bite into the bullets. They install best on softer bullets. Of course, you need a press, and the proper size die to crimp them.

I bought 500 just for the heck of it, and tried them on some 40 S&W bullets, that were very soft. They worked just fine. I never bought any more of them, as they were just an experiment for me.