This barrel is presently chambered for a tight neck .243 that I have never shot. I bought the Panda actioned silhouette rifle for the action. I am thinking of rechambering the .243 barrel to something like the 6mm GT or 6x47 or perhaps a 6xc. The barrel is 1.25inches at the receiver and has 1.1x diameter for the last 4 inches. The barrel is presently 25 inches and I am thinking of using it to teach one or more of my 9 grandsons how to shoot. Should I rechamber or perhaps take 2 aspirins and forget it. James Mock PS-It now has a McMillan 3inch fore end BR stock and I have a PPC and a Dasher barrel for it.