ORIGINAL: firstshot

I'm reloading 7MM-08 (not that it matters) and have been neck resizing only. I've read that periodically you need to full length resize cases after you neck resized a number of times.

I've got a couple of questions.

1. If a case forms to your chamber when you shoot the gun, why would you ever need to full length resize? I understand why you need to periodically trim the case length, but why would you have to occasionally full length resize.

2. If you do need to occasionally full length resize, how do you know when you need to do it? How many times can you neck resize only before you need to full length resize?

firstshot
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