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Great minds or fools seldom differing Micky?

If that's the case, try anyway get it to the point where the press doesn't reach full travel if you have to.

If it still won't chamber that tells you that the chamber the brass was previously...

I have an idea on what might be going wrong.
Is the fired brass from your rifle? A few above have assumed not I didn't see if you've confirmed.

If it is not, the fact you are talking about...