No, you shouldn`t have to "stand" on the press.
I suspect the brass is military and was fired in a machine gun of some type. The military chambers are a bit large to insure reliablity in the field, but allow the brass to over expand when fired. They are a real pain to size at times and are the reason I don`t use goverment cases for my loading.
Once you`ve sized and fired them in your chamber they should be easier to work with in the future. Be sure to keep them well lubed and check the lenght after the initial sizeing that you`re doing now. The excessive sizeing can cause them to lenghten quite abit and they might need trimming.
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I must confess, I was born at a very early age. --Groucho Marx
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