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I've done some searching and really can't put my eyes on anything here. I have a new Sig 556 DMR. I've been reloading handgun cases for many years (used a Dillon 550 for 22 years now), but never a rifle case. The first issue I have is my weapon is putting a "V" shaped dent, deforming the case mouth on every round. Is this normal? I would full length resize, but that only sizes from the outside in, correct? How does one get that V shaped dent back to make the neck at least close to round?

Thanks,
Jim
 

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My RCBS Full Lenght Resize die for 223 reshapes the throat inside when the decapping die goes in and out while popping the primer. If it's bent too much to get the decapper inside you can manually work it somewhat straight before decapping with an awl or similar tool.
 

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Depending on how dented it is, you may need to use some sort of tool to partially straighten the case mouth prior to resizing. As Zeus pointed out, the expander ball expands the case neck to the proper diameter as the case is removed from the sizing die. So, the outside of the case including the neck is sized first when the case is inserted all the way in to the sizing die and then the inside of the neck is sized as the case is removed from the sizing die.
 
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