25 Crown mag

I'm I the only one with trouble loading 25 cal JSB Kings/Heavy/heavy MarkII loading in my 25 cal Crown mag. First couple loads ok but about half way through you have to have something to push them in. They do not feed without having to tap on mag. No trouble with any JSB's in my WildCat or Impact, What UP, HELP Please 
 
I had the same problem on my Impact. It turns out the inner carousel is out of round. I had to take some material off the inside of the magazine outer case to get the MKI and MKII ammo to load and the magazine to function properly. I have read about others with he same problem. Sounds like they are having the same issue with Crown magazines. You would think there would be better QC on a $80 magazine.