Im guessing that they haven't been sized correctly, or the bullet is sticking too far out of the case and getting stuck in the rifling.
Check the diameter of the brass with some GOOD calipers and compare to spec on that case.. Even a couple thousandths could cause you headache with a tight chamber.
It looks like the case should be no more than 10.74mm at the neck and 10.77 at the base. Check the length of the brass also as that could also cause a problem.. Its unlikely that they have lengthened, but it is possible.
I would pull the bullets, kill the primers with oil, pop them out, resize and reload.
Hope this helps!