Loaded round tool

[Major Tom]

What is the 'tool' used to check a loaded pistol round's dimensions? I remember it was a drop-in type?
Thanks guys

[blackhawknj]

I use a barrel for a semiauto pistol and the cylinder for a revolver.

[lyman]

LE Wilson makes them,
they are called a Case Gauge

https://lewilson.com/case-gage

[togor]

Not just for pistols either.

[barretcreek]

Dillon sells one by EGW.

[Major Tom]

I settled on a Lyman tool for many calibers in one tool.

[Allen]

I use a barrel for a semiauto pistol and the cylinder for a revolver.

Doesn't work that well for blind people.

[Major Tom]

LOL