The M1 carbine round was the first caliber I ever loaded at the tender age of 15 and I learned two important lessons.
First, use lube! I forget the particulars, I know I had a lube pad and I guess I didn't use enough lube and stuck the case, but good. I went to the gun store and bought a stuck case remover. It pulled the threads out. I used the next size up tap and pulled the threads out of that too. At this point I swallowed my pride and took the die to the gunshop where I bought my dies and let the gunsmith handle it. He had to put the die in acid and dissolve the brass to get it out and I the acid turned my shiny carbide RCBS sizer almost black.
Second, they need trimming. I had no concept of cases stretching back then and somehow got away with it with no problems till the bolt wouldn't go into battery fully. At first I'd just hit the op handle with my palm but after the next loading, I'd slap it closed and then the next round I couldn't get it closed on my reload nor a new military round. By using a .410 brush in the chamber I was able to pull out a brass ring where the rifle trimmed the case! Not knowing any better I did this dozens of times till I learned cases need to be trimmed. I rushed out and bought a trim die and then realized the ram on the rockchucker was too short. Good ole RCBS also sells (or did) an extended shell holder for the carbine. I got one and a new file and was good to go.
I left my dies in an apartment when I moved years ago and have recently replaced them and bought a caliber conversion kit for my Dillon so I need to get the old Plainfield out and exercise it and the Winchester more often.
Phillip McGregor (OFC)
"I am neither a fire arms nor a ballistics expert, but I was a combat infantry officer in the Great War, and I absolutely know that the bullet from an infantry rifle has to be able to shoot through things." General Douglas MacArthur