Case gauge verification

A case gauge should be part of every reloaders tool box. One for each caliber you load is essential. The gauge is basically a machined steel replica of your guns chamber which allows you to physically drop a completely restored case and a completely loaded round to verify it drops fully into the chamber unfettered.
If this happens successfully you know it will chamber correctly in your gun. You can also do the same test with your gun barrel in the absence of a gauge by dropping a case or loaded round into the chamber of the barrel to ensure it drops fully and freely into and out of the barrel's chamber.
We see shooters at the range often suffering annoying and sometimes dangerous jams, incorrect or inconsistent feeding as well as faulty ejection. Many of these issues are related to case prep being incomplete such as a lack of final crimp of handgun cases, flawed sizing of the case and case bulge that reaches the point of interfering with successful chambering.
With a case gauge you can verify your cases and new fully loaded ammo will work in the gun successfully.