Hmmm! I have four of the rotary factory mags for my two A22s, They originally were all a little stiff to start, but I think that after 8-10 loadings & the fact that I store them loaded, has made them pretty easy to load these days.
Also, like J.Baker says, maybe it is just finding the right angle & direction to push the round. I usually just dump ten rounds out of the box into my left hand & maneuver one rd. base into the base slot (nose about 30 deg. up & 15-20 deg. rt.) and push it left & down into the slot with my thumb and it clicks in. A little harder than the straight 10 rd. mags of my FVSR, but certainly not horrible!