I'll second the notion that it's probably an ejector problem, though I haven't heard all good things about Wolf ammo, primarily due to the steel cases. You may run into other reliability problems with this in your DPMS which, if I am not mistaken, should have a match chamber...
Back to the ejector -- strip the bolt out of the rifle and hook a spent casing under the extractor, pushing on the ejector. You should be able to push the casing flat against the bolt face, depressing the ejector smoothly and easily against it's spring. If your casings are burred or gouged in some way (i.e., ammo problem) I suspect you'll feel them rubbing somewhere. Also, if the ejector is binding, you should be able to tell this way. This is a good exercise to perform when cleaning, too, after putting a drop of CLP there to lube the ejector.
Finally, don't give up -- I don't know what your past experience with AR's is, but they can be a bit ammo-selective until they get a few hundred rounds through them, then they tend to run pretty well. Best wishes.
Andrew