Accurate and easy - Hornady Lock-N-Load Ammo Concentricity Gauge

I got this to check and fix concentricity of my federal gold medal sierra match 175gr bthp. Great ammo but I was getting fliers. Using this tool I learned that some boxes had all 20 rounds within .001" concentricity and other boxes were off by as much as .007". Both ends of the spectrum were fairly rare and the bulk of the ammo was around .003-.004" off. This made it easy to measure and fix all those factory rounds. For the price of 3 boxes of ammo (after tax) I was able to buy this tool and make all my rounds perfectly concentric. The result is MUCH tighter groups and the fliers are a thing of the past.

It came with parts to measure smaller and larger calibers but I don't shoot my 5.56 AR for precision and I don't own a .50, but for those out there who do you should be able to check all calibers.