You really haven't been paying attention, have you?
There have been many reports of poor feeding, though I have owned at least 10 of them and have also seen no problem.
It is true, however, that they don't feed as smoothly as a 30-06 or other slimmer rounds with more generous body taper and less acute shoulder angle.
As far as magazine capacity, I don't place much value beyond the third round myself, but a lot of guys on this forum do.
Either way though, it appears that performance of the RCM rounds will be very close to the 30-06 and 338-06 in handloaded form due to limited case capacity.
With no performance advantage, you really have to LOVE short actions to jump in.
_
