I agree that it probably is not necessary to run new bullets through a sizing die.

I got the Lee bullet sizing dies as an experiment to possibly salvage some pulled rounds
I was surprised by the variance in the amount of force needed to size the rounds…

Just for kicks I ran a box of new bullets through the sizing die and found that some slipped right through while others required a fair amount of force to go through… (a variance in the production process?)

I use the Lee bullet sizing dies to try to remove some of that variance… (not so sure if it helps I do not separate the bullets by the force needed to size them)

Jeff Siewert\’s book \”Ammunition Demystified\” addresses this a bit … when he covers the initial engraving force of the rifling on a fired round.

I\’m still learning and adapting my reloading processes …