If you time it just as you feel the last round leave the charger clip move the thumb pressing on the top cartidge forward just a smidge it takes allot of practice but once you've done it allot it becomes just natural it stops the rim locking event, we also tried loading the cartridges in another way which seemed to work I never tried it doing it as I always loaded mine the accepted way.
Others loaded them like this; ///// try it and see what you can do, also go through your charger clips and find the easy ones that the rounds slide out of easier.