WTF! What the hell expanded the necks? I am going with the other guys.There will be very little neck tension if the necks are not resized
Just re-seat and you should be good to go. If it feels loose then I'd resize it.
There are two opposing opinions!
not like the case was expanded by pressure being fired.
WTF!
I myself will resize the neck, if you have a neck die, so you know that the bullet has proper tension.
On pulling the bullet, the neck will `spring back`, typically about one thou. of ID dia.. If one reseats without resizing, the neck tension of that reseated round will be around one thou.+-. That will likely be much less than rounds loaded normally.There will be .. less .. neck tension if the necks are not resized
Let's take this a step farther. Could you re-seat the same bullet?
That has been my experience and there is nothing more frustrating than having a semi-loose bullet being dumped into your action along with the powder charge,what a mess.I had that happen a time or two early on and since then for the bit of extra time it takes I just go ahead and re-do the necks to be on the safe side.If they are to be hunting rounds that will get rough treatment, resize the necks. If they will be shot at the range and get careful handling, just re-seat. If you want absolute consistency in ALL your rounds for some reason, resize.
The necks will be expanded a bit by the bullet seating process, and will "spring back" when you pull them, but not to the original dimensions of the necks after your initial resizing.
Take the decapping pin out of your expander decapper assembly.Now here is another question. How do you resize the neck without knocking out the unfired primer.



























