At the low end and the high end, it was dead on. Easy to install- watch you tube video. Good quality material& zipper with 3 choke tubs cal& six elastic bands. The inside of the case itself measures about 4. At the low end and the high end, it was dead on. Doesn't tear a hole in my lip like the hard plastic one I had. Just shot 5 rounds at 50yrds, but could tell immediate results.