Kinda need some help here folks...

Trying to set up my RCBS power case trimmer to prep some 380 ACP brass. My problem is that I can't get the cutting head close enough to the case. I can't find my owner's manual at the moment and the RCBS website is ridiculously slow.

Am I doing something wrong here or is the 380 ACP just too short to trim on the RCBS power trimmer?