I have an old Beseler drum I used to process 8 X 10 Cibachrome prints back in the day. I just bought my first 4X5 camera a few weeks back and decided to use that drum to process my film. The drum takes 2.5 ounces of chemistry. Out of curiosities sake, I loaded four 4X5 sheets of film into the drum (some of my test shots) and added the 2.5 ounces of Xtol. The negs came out perfectly. I did make sure the drum was absolutely level so each negative would get covered by the developer. So you should have no problems with your drum and the amount of chemistry it takes.

Jim B.