Cleaning your cases with corncob or other dry media? 

This is probably must have upgrade since there are quite few jams due to the jams in 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. 

Debris Out Casefeeder Adaptor, which replaces the original Dillon case feeder adaptor on your XL650 / XL750, the slots cut in the tube allow the debris to fall out the sides onto the small collection tray that greatly reduce chance of jamming.