Can you neck size with a full size die?
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^^
Yes. Like Cosmic said.
When I read the OP's question I was thinking 303, not 308. I use the FL die to size the neck and a bit of the body so the cases chamber, without allowing a lot of case stretch on firing.
For 308 I use a bushing neck sizer.
If the case has unequal case wall thickness the thin side will expand more when fired creating the warped banana shaped case. Meaning a neck sized case or partially full length sized case if warped will cause the bullet to be out of alignment with the axis of the bore. Below German Salazar is answering a question about partial full length resizing and why you are better off by complete full length resizing with minimum shoulder bump.
Reloading: Partial Neck Sizing
by German A. Salazar
http://riflemansjournal.########.com/2010/06/reloading-partial-neck-sizing.html
"Now the last scenario, a full-length sized case in which the neck is also fully sized. There is clearance at the neck and in the body of the case, the closest fit anywhere is the bullet in the throat. If the neck to bullet concentricity is good (although it needn't be perfect), then the bullet will find good alignment in the throat and the case body and neck will have minimal influence. Let's not forget that the base of the case is supported by the bolt face or the extractor to a certain degree as well; this is yet another influence on alignment. As you can see, there are several points from base to bullet that can have an effect. My procedure is to minimize the influence of those that I can control, namely the case body and neck, and let the alignment be dictated by the fit of the bullet in the throat and to some extent by the bolt's support of the base. Barring a seriously out of square case head, I don't think the bolt can have a negative effect on alignment, only a slightly positive effect from minimizing "case droop" in the chamber. Given that a resized case will usually have a maximum of 0.001" diametrical clearance at the web, this isn't much of a factor anyway."
Bottom line, with a full length resized cartridge case the body of the case is not touching the chamber walls and has no effect on bullet alignment with the bore. Meaning the bullet has "wiggle room" to self align with the bore. The only part of the case that touches the chamber wall is the case shoulder as it is pushed forward by the ejector and firing pin.
Meaning the case should fit the chamber like a rat turd in a violin case.
Reloading: Partial Neck Sizing
by German A. Salazar
http://riflemansjournal.########.com/2010/06/reloading-partial-neck-sizing.html
"Now the last scenario, a full-length sized case in which the neck is also fully sized. There is clearance at the neck and in the body of the case, the closest fit anywhere is the bullet in the throat. If the neck to bullet concentricity is good (although it needn't be perfect), then the bullet will find good alignment in the throat and the case body and neck will have minimal influence. Let's not forget that the base of the case is supported by the bolt face or the extractor to a certain degree as well; this is yet another influence on alignment. As you can see, there are several points from base to bullet that can have an effect. My procedure is to minimize the influence of those that I can control, namely the case body and neck, and let the alignment be dictated by the fit of the bullet in the throat and to some extent by the bolt's support of the base. Barring a seriously out of square case head, I don't think the bolt can have a negative effect on alignment, only a slightly positive effect from minimizing "case droop" in the chamber. Given that a resized case will usually have a maximum of 0.001" diametrical clearance at the web, this isn't much of a factor anyway."
Bottom line, with a full length resized cartridge case the body of the case is not touching the chamber walls and has no effect on bullet alignment with the bore. Meaning the bullet has "wiggle room" to self align with the bore. The only part of the case that touches the chamber wall is the case shoulder as it is pushed forward by the ejector and firing pin.
Meaning the case should fit the chamber like a rat turd in a violin case.
