I use 28xx drums for 7x17 processing with no issue.
Originally Posted by RedSun
In fact, the idea that the ridges inhibit chemical flow seems farsical to me as the film does not sit hard up against the barrel wall (it only touches in the very middle of the sheet, and only very lightly then), allowing chemicals to get in behind.
In addition, as I always run a double pre-wash (3 minutes/empty/2 minutes), the AH layer is generally gone before the developer touches a sheet. What's left will be removed during the following stages (however, there has NEVER been any AH colour staining of the Developer/Stop/Fixer, leading me to assume that the whole of the AH layer is removed during the prewashes).