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you want less run out as far as concentricity goes..when seating stop part way in and rotate shell and continue....Ive always done it as shown to in beginning and when others who were sceptical have...

and if you are a good wee reloader,in your box of bits will be your "dummy round" to use to set up your die with so your seating depth is the same every time... your resizing die will be either hard...

thats one of the flash newer ones...now I would glue the plurry insert bit in permanently and use it like the solid older jobbies.