Here's a diagram of a rifle chamber:
http://bisonballistics.com/articles/...rifle-chambers
Are you sure that you are not feeling the throat? A Wylde chamber would have a relatively long throat.
Scroll down in this link:
http://m14forum.com/ammunition/11399...e-chamber.html
The Wylde reamer is about .013 over trim length and a Clymer NATO reamer is .015 over. By comparison, business cards are .013 to .017 thick.
Depending on the length of your brass, having .020" extra length does not seem too excessive. Your Sinclair tool is very likely measuring to a point on the transition(angle) between the neck and the throat. I would be more worried if you measured any amount too little length.
If you are still worried, take it to a gunsmith that has a bore scope.
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