You didn't say what format your using, but I develop my 4x5 Ilford Delta 100 and 400 in HC110 with excellent results. When printing the 100 16x20in. I often have trouble finding the grain to focus. The 400 grain is easier to see when focusing, and there is no difference in the prints that I can see with the naked eye. If you use the 400, the development time given by Ilford for HC110 (solution B), 8 1/2 min. is too long for normal exposures, unless you want really dense negs. I usually develop for 7 min. With the 100, the recomended time of 6 min. works fine.(posted 9094 days ago)