Reeder Custom Guns - Pulling bullets

I pulled 120 7MM Rem Mag bullets with an RCBS Collet Bullet Puller. Do I need to resize all of the cases again with my full length sizing die with the decapping pin removed?
I was very surprised that some bullets pulled easily while others required quite an effort to remove them from their cases. These cases have only been fired a time or two in my two 7MM Rem Mag rifles.

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the tightness of the neck could be the difference in your two rifles if some were fired in one rifle and the others in the other rifle. Also not all cases are the same. Some necks may be a bit tighter due to neck wall thickness.

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Thanks for the reply. I will full length rezize my casings tomorrow. I try to keep my casings for my two 7 Mags separated and stored in their own boxes, but maybe I managed to get a few mixed up when sighting in on the same bench. I'm going to read up on annealing the case necks. I hope annealing isn't a tedious complicated project.

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Pulling bullets

it would be a good idea to re-size them. The difference in

Pulling bullets