An oldish thread, but I'll comment.
any of you ever experience difficult feeding with the wsm, rsaum, or wssm cartridges.
I don't think any of the WSSM's have ever fed as reliably as most would like. I've never owned one, but I read about more issues with these than anything else. Some of the very early WSM's had some issues, but manufacturers figured out that some minor tweaking of things like feed lips, feed ramps etc solved the problems. I've never known of a problem with them feeding once the problems were solved. My model 70 in 300 WSM has always fed just fine. No experience with the Remington short magnums. By all accounts the Ruger Compact magnum rounds worked fine in their guns. I don't think they were ever offered by anyone else.
BTW: I'm still trying to figure out why a control-feed rather than a push-feed bolt is a must for a dangerous game rifle(?)
FWIW, the original concern with push feed was not about being chased up a tree by a lion; it was about leaving an unfired cartridge in the chamber and pushing the bullet point of the next round into its primer, with interesting results.
This is one reason, but not the most significant in my opinion. With PF once a round is in the chamber the only way to get it out is to completely close the bolt, then open it and eject the round. The fear was/is that an excited hunter would partially chamber a round, then try to chamber a 2nd round creating a bad jam and useless rifle, and possibly a chain fire. With CRF the rim is grabbed shortly after leaving the magazine. If the shooter screws up that round will be ejected when the bolt is pulled back and a fresh round can be picked up and chambered into an empty chamber.
That is great in theory, but I'm not aware of it ever actually happening to anyone.
The name "controlled round FEEDING" is misleading. A PF rifle will feed equally well and maybe more reliably. The design is simpler and works at least as well FEEDING rounds into the chamber. A CRF rifles real advantage is a much more rugged and reliable EXTRACTION and EJECTION system. Even in the original scenario it is more reliable ejection that prevented a problem, not feeding.
For a rifle used in harsh, dirty conditions where it might see more abuse and have to be used dirty a CRF rifle is much more likely to function. It doesn't take much dirt, dust, mud, snow, or ice to prevent a PF rifle from ejecting or extracting. That isn't a problem hunting whitetails in the back yard. But for a guy spending 2 weeks in the wilderness of Alaska hunting out of a boat around lots of mud and in bad weather a CRF rifle offers a bit of extra security. Especially hunting something that could kill you. Or in the dusty, dirty African bush. Todays African hunters hunt during the day and stay in comfortable settings each night. 100 years ago when CRF was in its hey day an African Safari meant weeks in the bush in harsh dirty conditions.