I have two different carbide dies here that will produce two different sized cases when used. One is a Lyman and the other is a Hornady (Custom Grade Die). I loaded up a dozen of each last year to see if it made any difference in accuracy. One showed a “bulge” in the case when the bullet was seated and one did not. It made no difference at all on paper. Darn, there went a really good excuse. I think wadcutter brass probably got started back when SW model 52’s were all the rage in bullseye. They were fully seated bullets in order to be used in the model 52’s. I don’t think there’s enough difference to change performance. I still have a bunch of brass with the canalure in the middle and it shoots and loads like everything else. There may actually be a difference but I can’t find it in performance. But maybe it’s just me?