I'm using it for .38 spl, 9mm, and .45 acp and seems to be accurate. As indawind said, it prefers the hotter loadings but lighter loads are not too dirty, it probably wouldn't be my first choice for powder puff loads. I'm getting good results using the loads Hodgsdon recommends. Start low, it builds pressure fairly quickly. Meters great in the Lee Autodrum, haven't seen many reviews, thought I was the only one using it!