I full-length resize all new cases, whether I purchased R-P, Winchester or Federals. After resizing, I measure them with a caliper, and if any are quite a bit longer than the average, I trim them. I prefer all my cases to be the same length at the start, so they remain relatively uniform over the life of the case. I then chamfer and deburr all the cases. Again, uniformity. Now, I only handload for rifles, and hunting loads at that, so I normally do not load more than forty cartridges at a sitting, so this process is not that tedious. If I was reloading varmint or pistol/revolver cartridges in batches of hundreds, I might feel differently.

Although all the new cases I have purchased (.30-06, 7mm Rem Mag, .30-30 Win, .338 Win Mag) have been well-manufactured, they do get a little beat up during shipping and handling. Case dents, as long as they are small, do not concern me. Out-of-round necks do, which is why full-length resizing new cases makes sense to me. You are not going to rework the case much, since they come "full-length" from the factory. You are merely trueing them up before priming, charging with powder and seating a bullet.

Brian