If the rifle has been shooting factory rounds or other handloads OK - then the gun' s headspace isn' t your problem.......................but it CAN be your ammo' s headspacing that is off. If your die wasn' t screwed down into your press far enough, it could have set the shoulder too high, causing the feeding problem.

Also one other simple check.............did you trim the cases after resizing or at least check to make sure that the case length was within spec.?? If the case neck is too long, it can darn sure keep the round from entering the chamber all the way.