40-rod;
I had a similar problem with my C. Sharps 40-65. It turned out that if I ran a lubed case clear up to the rim (only have to do one time) it sized the area of the head that was a bit too large. Since is was the solid head portion that was a bit big, it was never necessary to do it again on any particular case.

Of course, you MUST remove the decapping rod, use a small shell holder (something like a Hornet is near perfect) and set the case on TOP of the shell holder and push it clear up to the rim. Then use an appropriately sized dowel rod and knock the case from the die. It is easy, quick and solved my problem. Give it a try, can't hurt anything.

Dale53

No the body is too small by about .004. After I couldn't get it to chamber on the first pass I tryed running it up all the way into the die it helped a little but still couldn't get it to chamber so I made a chamber cast and miked the cast and a formed case. The neck and sholder are fine the body of the chamber is small by about .004 then the rim is fine. I checked the dimentions with Donnelly's book on cartritge conversions. What I need to do is put it in the lathe and use a proper size reamer to open up.

40 Rod

40Rod;
Go to Google and write "chambering reamers". I got several "hits".

I haven't used any of them but I have heard of people who have used these people with satisfaction:

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Dale53

Also:

4-D Products Inc.

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Got the info from the June/July 2004 Machinists Workshop.