Welcome to GBO! Basics for FTE, too hot hand loads, Milsurp, dirty or oily chamber or ammo will all cause stuck cases. Clean, dry chamber and ammo is paramount. Next is polishing of the chamber which is standard procedure for any ejector equiped barrel, can be done with a patch wrapped bore mop chucked in a drill, use flitz, JB bore compound or any fine metal polish, just polish it a couple minutes changing the patch and adding polish frequently. You can also use a fired case with a screw stud stuck in the flash hole and chucked in a drill.
Ejector tuning may be required, R&R the ejector using the ejector conversion info in the FAQ and Help sticky, place a BB ahead of the ejector spring to increase ejector pressure, polish the ejector and housing before reassembly, use a dri-lube like Hornady One shot or Elmer's Slide-All.
Another option to deal with those rifles that stick an occasional case just when you thought you had the problem fixed is to cut a notch just big enough for the tip of a pocket knife blade to flick the shell out. There are pics at the bottom of the page at Fred's link below. A dremel burr will do the job very easily.
If you still have stuck brass, there could be a serious issue with the chamber that only a trip to H&R will cure, but I've not had a problem like that with any of my 30+ barrels.
Tim
http://www.angelfire.com/ma/ZERMEL/hrultrawp.html