Cleaning your cases with corncob or other dry media?
This is probably a must-have upgrade since there are quite a few jams in the adapter tube. Often, small bits of corncob remain mixed with the brass and are fed down the case feeder tube. When they reach the tighter diameter of the adaptor tube, they wedge against the cases, causing a feeding jam.
The Debris Out Casefeeder Adaptor, which replaces the original Dillon case feeder adaptor on your XL650 or XL750, has slots cut in it that allow the debris to fall out the sides onto the small collection tray, greatly reducing the chance of jamming.