I do not believe the RIFLE is causing your problem. And, if as you say, the cases are withing specs for length, the only other factor that is causing difficulty closing the bolt is that the cases aren't being sized enough. The die needs to be screwed down toward the shellholder more to push the case shoulder down a little more. But rather than screwing it down solidly against the shellholder which could result in shoving the shoulder back TOO MUCH (thus causing an artificially introduced excessive headspace condition), just take a lubed empty case and size it a little more than previously by screwing the die into the press perhaps 1/4 of a turn more, then try to close the bolt on it. Repeat this "screwing down" process as necessary, until the bolt will close on the resized case with JUST A LITTLE PRESSURE on the bolt handle. This way you can avoid artificially introduced excessive headspace by setting the shoulder back TOO MUCH, and also avoid working the brass excessively, thus improving case life.

IF your die is screwed down to where it is touching the shellholder, and the cases sized with it set this way still cause trouble, you may have to file a little metal off the top face of the shellholder to permit a little more resizing. However, IF your shellholder and sizing die are of the same make, this should NOT be necessary.