Thread: Do you always need to case trim?

Measuring the distance from bolt face to the lands seems to be rather imprecise. Variation from one attempt to another is typically 0.005". Usually it's recommended to repeat measurements several times and average.


Wide ranging discussion. Cleaning rod method is outlined in the 4th post by "Woods"


Shoulder to lands measurement @kimjon shows a home made device. This guy is a DIY mechanical legend (and expert hunter). He got very reproducible measurements with this.


Comparison of "slotted neck" with "home made rod through flash hole" methods.