The RCM's are far from dead. No you are not going to find ammo for the RCM at your local Walmart, every sporting good store in my area carries it, plentiful sources are available on the Internet. So all of this BS about not being able to get ammo, is simply that, BS.
The 300 RCM is a great little round,
Extremely effective and accurate out of my full-sized 22 inch barrel Hawkeye.


I won't drink the swirled Kool-Aid
.....well, maybe, if it looks like wood