Originally posted by Earl E. Nov...mber: I am a bit fastidious about deburring mine.. I typically like to square the end of the tube with a mill file,, then "slightly" deburr the inside with a deburring tool.A large chamfer on the inside of the tube promotes splitting out if you hit something too solid such as a hard stump.. The smaller the chamfer, the more tube in contact with the insert, the less likely it will be to allow the insert to push inside the tube.
Originally posted by far rider: Try a deburing tool made for reloading. RCBS makes one for sure, but I expect any of the reloading companies have one. Fairly cheap.